The document describes the development of the pharyngeal arches, pouches, and clefts in early human embryogenesis. It states that the pharyngeal arches develop as six curved mesenchymal thickenings on each side of the primitive pharynx. Each arch gives rise to specific skeletal, muscular, vascular and nervous derivatives. The pharyngeal pouches form as outpocketings between the arches and give rise to structures such as the tonsils and parathyroid glands. Pharyngeal clefts form between the pouches and contribute to structures like the external auditory meatus. Congenital anomalies can result if development of the arches, pouches or clefts is disrupted.
The document summarizes the development of the pharyngeal arches and pouches in humans. It discusses that the pharyngeal arches develop as thickenings in the foregut wall to support the primitive pharynx. Originally six arches form, though the fifth is small and disappears. Between the arches are endodermal pouches and ectodermal clefts. The structures that derive from each arch are described, including muscles, arteries, nerves and skeletal elements. The fate of the endodermal pouches is also outlined, many contributing to structures of the ear, throat and thyroid gland.
The external ear, middle ear, and internal ear all develop from thickenings and pouches of ectoderm and mesoderm that form early in embryonic development. The external ear develops from six hillocks that fuse to form the auricle, while the external auditory meatus develops from the first pharyngeal cleft. The middle ear forms from the first pharyngeal pouch and cleft, and contains the tympanic cavity and three ossicles that develop from cartilage. The internal ear forms from the otic placode and vesicle, which give rise to the membranous labyrinth and its sensory structures for hearing and balance.
The document discusses the development of the ear, including the external, middle, and internal ear structures. It describes how the otic placode invaginates to form the otic vesicle, which then develops into the membranous labyrinth. The ventral part forms the saccule and cochlear duct, while the dorsal part forms the semicircular ducts and utricle. The first pharyngeal pouch develops into the middle ear cavity and auditory tube, while the first pharyngeal cleft forms the external acoustic meatus. Various congenital deformities of the external ear are also mentioned.
The infratemporal fossa is located below the temporal fossa. It is bounded by the ramus of the mandible laterally, the maxilla anteriorly, and the lateral pterygoid plate medially. The infratemporal fossa contains the mandibular nerve, maxillary artery, pterygoid venous plexus, and the medial and lateral pterygoid muscles. The maxillary artery passes through the infratemporal fossa and gives off several branches including the middle meningeal artery, accessory meningeal artery, inferior alveolar artery, and infraorbital artery. It communicates with surrounding areas through gaps in bones and openings in the skull.
The scalp receives its blood supply from branches of the external carotid artery and the ophthalmic artery. The main arteries supplying the scalp are the superficial temporal artery, the posterior auricular artery, and the occipital artery. Venous drainage of the scalp occurs through the external jugular vein and anterior jugular veins. Sensory innervation of the scalp is provided by branches of the trigeminal nerve and cervical nerves depending on the location on the scalp.
The Ansa cervicalis is a nerve loop that lies in the carotid sheath over the larynx and supplies the infrahyoid muscles. It is formed by a superior root from the hypoglossal nerve and first cervical nerve, and an inferior root from the second and third cervical spinal nerves. These roots join in front of the common carotid artery to innervate the sternohyoid, sternothyroid, and inferior belly of the omohyoid muscles, while separate branches from C1 also innervate the thyrohyoid and geniohyoid.
The document provides an overview of the arteries of the face. It notes that the face is supplied by branches of the external carotid artery including the facial artery, transverse facial artery, and maxillary artery. It also discusses the internal carotid artery and its terminal branch, the ophthalmic artery, which gives off the zygomaticofacial and dorsal nasal arteries that supply parts of the face. The anastomoses between the branches of the external and internal carotid arteries are mentioned as well.
The document discusses the development of the pharyngeal apparatus during the 4th week of intrauterine development. It notes that there are initially six pharyngeal arches that develop in the lateral wall of the primitive pharynx, although the 6th arch is small and disappears, leaving five arches. Between the arches are four pharyngeal clefts lined by ectoderm and four pharyngeal pouches lined by endoderm. The derivatives of the pharyngeal arches include muscles, nerves, skeletal elements, and other structures. Clinical syndromes can result from abnormalities in development of the pharyngeal arches and clefts.
The document summarizes the development of the pharyngeal arches and pouches in humans. It discusses that the pharyngeal arches develop as thickenings in the foregut wall to support the primitive pharynx. Originally six arches form, though the fifth is small and disappears. Between the arches are endodermal pouches and ectodermal clefts. The structures that derive from each arch are described, including muscles, arteries, nerves and skeletal elements. The fate of the endodermal pouches is also outlined, many contributing to structures of the ear, throat and thyroid gland.
The external ear, middle ear, and internal ear all develop from thickenings and pouches of ectoderm and mesoderm that form early in embryonic development. The external ear develops from six hillocks that fuse to form the auricle, while the external auditory meatus develops from the first pharyngeal cleft. The middle ear forms from the first pharyngeal pouch and cleft, and contains the tympanic cavity and three ossicles that develop from cartilage. The internal ear forms from the otic placode and vesicle, which give rise to the membranous labyrinth and its sensory structures for hearing and balance.
The document discusses the development of the ear, including the external, middle, and internal ear structures. It describes how the otic placode invaginates to form the otic vesicle, which then develops into the membranous labyrinth. The ventral part forms the saccule and cochlear duct, while the dorsal part forms the semicircular ducts and utricle. The first pharyngeal pouch develops into the middle ear cavity and auditory tube, while the first pharyngeal cleft forms the external acoustic meatus. Various congenital deformities of the external ear are also mentioned.
The infratemporal fossa is located below the temporal fossa. It is bounded by the ramus of the mandible laterally, the maxilla anteriorly, and the lateral pterygoid plate medially. The infratemporal fossa contains the mandibular nerve, maxillary artery, pterygoid venous plexus, and the medial and lateral pterygoid muscles. The maxillary artery passes through the infratemporal fossa and gives off several branches including the middle meningeal artery, accessory meningeal artery, inferior alveolar artery, and infraorbital artery. It communicates with surrounding areas through gaps in bones and openings in the skull.
The scalp receives its blood supply from branches of the external carotid artery and the ophthalmic artery. The main arteries supplying the scalp are the superficial temporal artery, the posterior auricular artery, and the occipital artery. Venous drainage of the scalp occurs through the external jugular vein and anterior jugular veins. Sensory innervation of the scalp is provided by branches of the trigeminal nerve and cervical nerves depending on the location on the scalp.
The Ansa cervicalis is a nerve loop that lies in the carotid sheath over the larynx and supplies the infrahyoid muscles. It is formed by a superior root from the hypoglossal nerve and first cervical nerve, and an inferior root from the second and third cervical spinal nerves. These roots join in front of the common carotid artery to innervate the sternohyoid, sternothyroid, and inferior belly of the omohyoid muscles, while separate branches from C1 also innervate the thyrohyoid and geniohyoid.
The document provides an overview of the arteries of the face. It notes that the face is supplied by branches of the external carotid artery including the facial artery, transverse facial artery, and maxillary artery. It also discusses the internal carotid artery and its terminal branch, the ophthalmic artery, which gives off the zygomaticofacial and dorsal nasal arteries that supply parts of the face. The anastomoses between the branches of the external and internal carotid arteries are mentioned as well.
The document discusses the development of the pharyngeal apparatus during the 4th week of intrauterine development. It notes that there are initially six pharyngeal arches that develop in the lateral wall of the primitive pharynx, although the 6th arch is small and disappears, leaving five arches. Between the arches are four pharyngeal clefts lined by ectoderm and four pharyngeal pouches lined by endoderm. The derivatives of the pharyngeal arches include muscles, nerves, skeletal elements, and other structures. Clinical syndromes can result from abnormalities in development of the pharyngeal arches and clefts.
Development of Respiratory System i lung bud & larynxRohit Paswan
The respiratory system develops from a respiratory diverticulum (lung bud) that appears as an outgrowth from the ventral wall of the primitive foregut at 4 weeks of intrauterine life. The lung bud is endodermal in origin. It develops into the larynx, trachea, bronchi and lungs. Specifically, the larynx develops from the cranial most part of the laryngotracheal diverticulum, which forms as a midline groove in the endodermal lining of the primitive pharynx. Cartilage, muscle and connective tissue of the respiratory system are derived from splanchnic mesoderm surrounding the foregut.
The document discusses the anatomy and clinical considerations of the submandibular gland. It begins by describing the location, structure and relations of the submandibular gland. It then discusses the blood supply, nerve supply, lymphatic drainage and clinical relevance when performing procedures in the submandibular region. The summary concludes by mentioning sialolithiasis, which are salivary stones that can form in the submandibular gland and cause obstruction.
This document describes the anatomy and physiology of the salivary glands. It discusses the embryology, microscopic anatomy, types of salivary glands including the major parotid gland. It describes the structures within the parotid gland such as arteries, veins, lymph nodes and the facial nerve. It also discusses surgical landmarks and applied anatomy concepts related to the parotid gland.
This document describes the formation of the notochord and differentiation of the intra-embryonic mesoderm in 5 steps. It explains that the intra-embryonic mesoderm forms from proliferating cells on the sides of the primitive node and streak. This mesoderm then differentiates into the paraxial, intermediate, and lateral plate mesoderm. The paraxial mesoderm forms somites which differentiate into sclerotome, dermatome, and myotome. The intermediate mesoderm forms the urogenital system, while the lateral plate mesoderm splits to form the somatic and splanchnic mesoderm separated by the intra-embryonic coelom.
The document describes the triangles of the neck. It discusses the anterior and posterior triangles, which are divided by the sternocleidomastoid muscle. The posterior triangle contains nerves like the spinal accessory nerve and brachial plexus. It is further divided by the omohyoid muscle into the supraclavicular and occipital triangles. The anterior triangle contains the carotid vessels and is divided into the submental, submandibular, carotid, and muscular triangles. Both triangles contain important muscles and nerves.
The document summarizes the bones and structures that make up the base of the skull, known as the norma basalis. It describes the bones that form the base - the hard palate, vomer, sphenoid, temporal, and occipital bones. It details the foramina and canals located in each bone, such as the foramen ovale, spinosum, and rotundum in the sphenoid bone and the structures that pass through them. Key anatomical landmarks of the base like the foramen magnum and jugular foramen are also outlined along with the structures transmitted through them.
Development of Face, Nose and Palate (Special Embryology)Dr. Sherif Fahmy
The document describes the development of the face, nose, and palate from five processes - the fronto-nasal process, two maxillary processes, and two mandibular processes. It explains how each process contributes to the structures of the face and palate. The maxillary processes form parts of the upper lip, cheek, upper jaw, and hard palate. The mandibular processes form parts of the lower lip, cheek, lower jaw, and floor of mouth. The fronto-nasal process forms parts of the nose, upper jaw, and primary palate. Congenital anomalies can occur if there are failures of fusion between the processes during development.
The larynx houses the vocal cords, and manipulates pitch and volume, which is essential for phonation. It is situated just below where the tract of the pharynx splits into the trachea and the esophagus.
The pterygopalatine fossa is a small pyramidal space located behind the maxilla and below the orbit. It contains the maxillary nerve, pterygopalatine ganglion, maxillary artery and veins. The fossa communicates with several areas through canals including the orbit, nasal cavity, infratemporal fossa and middle cranial fossa. It is an important distribution center for branches of the maxillary nerve and artery.
Tongue development, applied anatomy and prosthetic implicationsDr. KRITI TREHAN
The document provides information on the anatomy and development of the tongue. It discusses the tongue's embryological development from the pharyngeal arches, anatomy including muscles and vasculature, histology highlighting the different papillae and taste buds, and common clinical issues like infections and developmental disturbances. The tongue has intrinsic and extrinsic muscles that allow for various movements and plays important roles in speech, swallowing, and tasting.
The ear develops from three parts - the external, middle, and inner ear. The inner ear develops from thickenings in the ectoderm called otic placodes around 22 days. These placodes invaginate to form the otic vesicles which divide into dorsal and ventral components forming the structures of the inner ear. The middle ear develops from the first pharyngeal pouch and cleft, giving rise to the tympanic cavity and auditory tube. The ossicles develop from the surrounding cartilage. The external ear develops from swellings near the pharyngeal arches which fuse to form the auricle and the external auditory meatus develops from the dorsal cleft.
The anterior triangle of the neck contains three smaller triangles - the submandibular, submental, and muscular triangles. The submandibular triangle contains the submandibular gland and associated nerves and vessels, including the lingual and hypoglossal nerves. The submental triangle drains lymph from the chin and lower lip. The muscular triangle contains the infrahyoid strap muscles that depress the hyoid bone during swallowing.
The document discusses the anatomy of the palate, including its hard and soft parts. The hard palate forms the roof of the mouth and separates the oral and nasal cavities. It is made of bone covered by mucosa. The soft palate is a movable muscular fold that separates the nasopharynx from the oropharynx. It contains several muscles that allow it to elevate and depress. The palate develops from the fusion of embryonic processes and receives innervation from branches of cranial nerves. Clinical considerations include cleft palate and other congenital anomalies, injuries, lesions, and issues related to dentures.
The branchial arches develop in the 4-week old embryo and are associated with pharyngeal pouches and clefts. Each branchial arch contains a cartilage, cranial nerve, aortic arch, and myoblasts of neural crest origin. In humans, there are four well-developed branchial arches, though some derivatives of the fifth and sixth arches are also present. The branchial arches give rise to important head and neck structures like muscles, bones and nerves. Derivatives of the arches include parts of the ear bones, hyoid bone, larynx, and muscles of facial expression innervated by cranial nerves.
Development of Tongue, Thyroid Gland and Respiratory System (Special Embryology)Dr. Sherif Fahmy
The document discusses the development of several structures that originate from the floor of the pharynx, including the tongue, thyroid gland, and respiratory system. The tongue develops from swellings in the floor of the pharynx opposite the first and third pharyngeal arches. The thyroid gland begins as an endodermal proliferation between structures in the developing tongue and elongates into a duct that reaches the thyroid cartilage. The respiratory system develops from a diverticulum at the floor of the pharynx that forms the larynx and trachea, with the lungs developing from branching bronchial buds.
The infratemporal fossa is a space deep to the ramus of the mandible that contains nerves, arteries and muscles. It communicates with the temporal fossa and pterygopalatine fossa. The mandibular nerve passes through the foramen ovale and gives off motor and sensory branches that innervate muscles of mastication and sensation to the face. The maxillary artery passes through supplying branches. The pterygoid venous plexus drains the area.
This document discusses embryology topics including the bilaminar and trilaminar germ discs, and the pharyngeal apparatus. It describes how the bilaminar germ disc forms from the trophoblast and inner cell mass layers. It then explains how the trilaminar germ disc forms through gastrulation and the establishment of the three germ layers - ectoderm, endoderm, and mesoderm. The document also provides details on the development of the pharyngeal apparatus, including the pharyngeal arches, pouches, grooves, and membranes, and their adult derivatives.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The tongue develops from two parts - the anterior 2/3 forms from lateral lingual swellings that merge at the tuberculum impar, while the posterior 1/3 forms from the copula and hypobrachial eminence. The anterior 2/3 is innervated by the trigeminal nerve and the posterior 1/3 by the glossopharyngeal nerve. Common abnormalities of the tongue include microglossia (abnormally small tongue), macroglossia (abnormally large tongue), ankyloglossia (tongue tie), cleft tongue, and fissured tongue. These conditions can affect speech, swallowing, and dental development.
Development of Respiratory System i lung bud & larynxRohit Paswan
The respiratory system develops from a respiratory diverticulum (lung bud) that appears as an outgrowth from the ventral wall of the primitive foregut at 4 weeks of intrauterine life. The lung bud is endodermal in origin. It develops into the larynx, trachea, bronchi and lungs. Specifically, the larynx develops from the cranial most part of the laryngotracheal diverticulum, which forms as a midline groove in the endodermal lining of the primitive pharynx. Cartilage, muscle and connective tissue of the respiratory system are derived from splanchnic mesoderm surrounding the foregut.
The document discusses the anatomy and clinical considerations of the submandibular gland. It begins by describing the location, structure and relations of the submandibular gland. It then discusses the blood supply, nerve supply, lymphatic drainage and clinical relevance when performing procedures in the submandibular region. The summary concludes by mentioning sialolithiasis, which are salivary stones that can form in the submandibular gland and cause obstruction.
This document describes the anatomy and physiology of the salivary glands. It discusses the embryology, microscopic anatomy, types of salivary glands including the major parotid gland. It describes the structures within the parotid gland such as arteries, veins, lymph nodes and the facial nerve. It also discusses surgical landmarks and applied anatomy concepts related to the parotid gland.
This document describes the formation of the notochord and differentiation of the intra-embryonic mesoderm in 5 steps. It explains that the intra-embryonic mesoderm forms from proliferating cells on the sides of the primitive node and streak. This mesoderm then differentiates into the paraxial, intermediate, and lateral plate mesoderm. The paraxial mesoderm forms somites which differentiate into sclerotome, dermatome, and myotome. The intermediate mesoderm forms the urogenital system, while the lateral plate mesoderm splits to form the somatic and splanchnic mesoderm separated by the intra-embryonic coelom.
The document describes the triangles of the neck. It discusses the anterior and posterior triangles, which are divided by the sternocleidomastoid muscle. The posterior triangle contains nerves like the spinal accessory nerve and brachial plexus. It is further divided by the omohyoid muscle into the supraclavicular and occipital triangles. The anterior triangle contains the carotid vessels and is divided into the submental, submandibular, carotid, and muscular triangles. Both triangles contain important muscles and nerves.
The document summarizes the bones and structures that make up the base of the skull, known as the norma basalis. It describes the bones that form the base - the hard palate, vomer, sphenoid, temporal, and occipital bones. It details the foramina and canals located in each bone, such as the foramen ovale, spinosum, and rotundum in the sphenoid bone and the structures that pass through them. Key anatomical landmarks of the base like the foramen magnum and jugular foramen are also outlined along with the structures transmitted through them.
Development of Face, Nose and Palate (Special Embryology)Dr. Sherif Fahmy
The document describes the development of the face, nose, and palate from five processes - the fronto-nasal process, two maxillary processes, and two mandibular processes. It explains how each process contributes to the structures of the face and palate. The maxillary processes form parts of the upper lip, cheek, upper jaw, and hard palate. The mandibular processes form parts of the lower lip, cheek, lower jaw, and floor of mouth. The fronto-nasal process forms parts of the nose, upper jaw, and primary palate. Congenital anomalies can occur if there are failures of fusion between the processes during development.
The larynx houses the vocal cords, and manipulates pitch and volume, which is essential for phonation. It is situated just below where the tract of the pharynx splits into the trachea and the esophagus.
The pterygopalatine fossa is a small pyramidal space located behind the maxilla and below the orbit. It contains the maxillary nerve, pterygopalatine ganglion, maxillary artery and veins. The fossa communicates with several areas through canals including the orbit, nasal cavity, infratemporal fossa and middle cranial fossa. It is an important distribution center for branches of the maxillary nerve and artery.
Tongue development, applied anatomy and prosthetic implicationsDr. KRITI TREHAN
The document provides information on the anatomy and development of the tongue. It discusses the tongue's embryological development from the pharyngeal arches, anatomy including muscles and vasculature, histology highlighting the different papillae and taste buds, and common clinical issues like infections and developmental disturbances. The tongue has intrinsic and extrinsic muscles that allow for various movements and plays important roles in speech, swallowing, and tasting.
The ear develops from three parts - the external, middle, and inner ear. The inner ear develops from thickenings in the ectoderm called otic placodes around 22 days. These placodes invaginate to form the otic vesicles which divide into dorsal and ventral components forming the structures of the inner ear. The middle ear develops from the first pharyngeal pouch and cleft, giving rise to the tympanic cavity and auditory tube. The ossicles develop from the surrounding cartilage. The external ear develops from swellings near the pharyngeal arches which fuse to form the auricle and the external auditory meatus develops from the dorsal cleft.
The anterior triangle of the neck contains three smaller triangles - the submandibular, submental, and muscular triangles. The submandibular triangle contains the submandibular gland and associated nerves and vessels, including the lingual and hypoglossal nerves. The submental triangle drains lymph from the chin and lower lip. The muscular triangle contains the infrahyoid strap muscles that depress the hyoid bone during swallowing.
The document discusses the anatomy of the palate, including its hard and soft parts. The hard palate forms the roof of the mouth and separates the oral and nasal cavities. It is made of bone covered by mucosa. The soft palate is a movable muscular fold that separates the nasopharynx from the oropharynx. It contains several muscles that allow it to elevate and depress. The palate develops from the fusion of embryonic processes and receives innervation from branches of cranial nerves. Clinical considerations include cleft palate and other congenital anomalies, injuries, lesions, and issues related to dentures.
The branchial arches develop in the 4-week old embryo and are associated with pharyngeal pouches and clefts. Each branchial arch contains a cartilage, cranial nerve, aortic arch, and myoblasts of neural crest origin. In humans, there are four well-developed branchial arches, though some derivatives of the fifth and sixth arches are also present. The branchial arches give rise to important head and neck structures like muscles, bones and nerves. Derivatives of the arches include parts of the ear bones, hyoid bone, larynx, and muscles of facial expression innervated by cranial nerves.
Development of Tongue, Thyroid Gland and Respiratory System (Special Embryology)Dr. Sherif Fahmy
The document discusses the development of several structures that originate from the floor of the pharynx, including the tongue, thyroid gland, and respiratory system. The tongue develops from swellings in the floor of the pharynx opposite the first and third pharyngeal arches. The thyroid gland begins as an endodermal proliferation between structures in the developing tongue and elongates into a duct that reaches the thyroid cartilage. The respiratory system develops from a diverticulum at the floor of the pharynx that forms the larynx and trachea, with the lungs developing from branching bronchial buds.
The infratemporal fossa is a space deep to the ramus of the mandible that contains nerves, arteries and muscles. It communicates with the temporal fossa and pterygopalatine fossa. The mandibular nerve passes through the foramen ovale and gives off motor and sensory branches that innervate muscles of mastication and sensation to the face. The maxillary artery passes through supplying branches. The pterygoid venous plexus drains the area.
This document discusses embryology topics including the bilaminar and trilaminar germ discs, and the pharyngeal apparatus. It describes how the bilaminar germ disc forms from the trophoblast and inner cell mass layers. It then explains how the trilaminar germ disc forms through gastrulation and the establishment of the three germ layers - ectoderm, endoderm, and mesoderm. The document also provides details on the development of the pharyngeal apparatus, including the pharyngeal arches, pouches, grooves, and membranes, and their adult derivatives.
Indian Dental Academy: will be one of the most relevant and exciting training center with best faculty and flexible training programs for dental professionals who wish to advance in their dental practice,Offers certified courses in Dental implants,Orthodontics,Endodontics,Cosmetic Dentistry, Prosthetic Dentistry, Periodontics and General Dentistry.
The tongue develops from two parts - the anterior 2/3 forms from lateral lingual swellings that merge at the tuberculum impar, while the posterior 1/3 forms from the copula and hypobrachial eminence. The anterior 2/3 is innervated by the trigeminal nerve and the posterior 1/3 by the glossopharyngeal nerve. Common abnormalities of the tongue include microglossia (abnormally small tongue), macroglossia (abnormally large tongue), ankyloglossia (tongue tie), cleft tongue, and fissured tongue. These conditions can affect speech, swallowing, and dental development.
Course in facial development for European Course in Neuroradiology in Tarragona, Spain, originally on 12 octobre 2008. Revised for November, 2010. For questions, e-mail to etchevers at free dot fr. Download for the animations to take place, as some pictures are covered by others.
Embryology of branchial arches applied anatomy by osama elhamzawyOsama Elhamzawy
This document discusses the embryology of branchial arches and their nerve supply. It begins by introducing the three germ layers and their derivatives. It then describes the development of the pharyngeal arches, pouches, and grooves during the fourth week of development. The fate of each pharyngeal arch is outlined, including the cartilage, muscles, and nerves derived from each arch. The derivatives of the pharyngeal pouches are also summarized, focusing on structures like the tonsils, thymus, and parathyroid glands. Finally, some common birth defects involving the pharyngeal region are briefly mentioned.
The pharyngeal apparatus in a 4 week old human embryo consists of pharyngeal arches, pouches, grooves, and membranes. The arches contribute to structures of the face, mouth, larynx and neck. Each arch contains mesenchyme, blood vessels, cartilage that ossifies into bones, and muscles. The pouches form structures such as the tonsils, thymus, and parathyroid and thyroid glands. The grooves separate the arches and membranes form at their floors, with only the first becoming the eardrum. By the end of development, most grooves and membranes disappear as the neck forms.
The tongue develops from three lingual buds that merge during development. The distal buds form the anterior two-thirds of the tongue, while the posterior third develops from the copula and hypopharyngeal eminence. Muscles are derived from migrating myoblasts and innervated by the hypoglossal nerve. Various papillae and taste buds develop in the fetus and establish reflex pathways. The nerve supply correlates to the embryonic origin, with the trigeminal, facial, glossopharyngeal, and vagus nerves innervating regions derived from different arches.
The tongue develops from tissues originating in the pharyngeal arches and swellings in the floor of the mouth. It begins developing at 4 weeks as a tuberculum impar surrounded by two lateral lingual swellings that merge to form the anterior two-thirds of the tongue. The root develops from the hypobranchial eminence originating in the third arch. Muscles of the tongue originate from occipital somites and are innervated by the hypoglossal nerve. The anterior two-thirds receive innervation from the trigeminal nerve and the posterior third from the glossopharyngeal nerve. The tongue separates from the floor of the mouth and develops four types of lingual papillae
The document summarizes the development of teeth from the dental lamina. It discusses how the primary epithelial band forms and divides into the dental lamina and vestibular lamina. Tooth buds then develop from the dental lamina, forming the enamel organ, dental papilla, and dental follicle. Teeth progress through developmental stages including the bud stage, cap stage, bell stage, and root formation. The dental lamina gives rise to both primary and permanent teeth before degenerating.
El documento describe las etapas del desarrollo odontogénico desde la 6ta semana de vida intrauterina. Inicia con la formación de la lámina dental a partir del ectodermo bucal, seguido por la aparición de yemas dentarias que evolucionan a la etapa de casquete y campana, donde se forman los órganos del esmalte, papila dentaria y saco dentario. Finalmente, en la etapa terminal ocurre el depósito de esmalte y dentina para formar la corona dental de manera aposicional.
The document summarizes the stages of odontogenesis, or tooth development, from the dental lamina stage through root formation. It describes how during embryonic development, the dental lamina thickens to form tooth buds, which develop through bud, cap, and bell stages. During these stages, the enamel organ and dental papilla form. Odontoblasts then deposit dentin while ameloblasts deposit enamel. After crown formation, the root develops through the formation of the epithelial root sheath. Cementum is later deposited on the root surface by cementoblasts.
This document discusses the stages of odontogenesis, or tooth development. It describes the five main stages of growth: initiation, proliferation, histodifferentiation, morphodifferentiation, and apposition. Key structures that form during these stages include the dental lamina, dental sac, dental organ comprising the inner and outer dental epithelium and stellate reticulum, and the dental papilla. Cells in these structures differentiate into formative cells that build the tooth structures, such as ameloblasts forming enamel and odontoblasts forming dentin. The shape of the tooth crown is determined during morphodifferentiation by the membrana preformativa.
1. La odontogénesis comienza con la formación de brotes epiteliales en los maxilares que se convierten en los órganos del esmalte.
2. Dentro del órgano del esmalte, la papila dental se diferencia en odontoblastos que secretan dentina, mientras que el epitelio interno se diferencia en ameloblastos que secretan esmalte.
3. El patrón de la corona se establece antes de que comience la mineralización de los tejidos dentales, luego la formación de la raíz es
El documento describe las etapas del desarrollo dental desde la formación de la lámina dental hasta la formación completa de la corona y la raíz. Se inicia con el engrosamiento del epitelio oral que da origen a los brotes epiteliales. Luego pasa a las etapas de casquete, campana y folículo dentario donde se forma la papila dentaria y los tejidos dentales. Finalmente se describe la histogénesis de la corona y la formación de la raíz guiada por la vaina epitelial de Hertwig.
Este documento describe la embriología dentaria y el desarrollo de la cavidad oral desde la concepción hasta el nacimiento. Explica que entre la 4 y 6 semana se inicia el proceso de odontogénesis mediante el cual se forman los dientes a partir de células ectodérmicas e ectomesénquima. También detalla las etapas de desarrollo de la corona y raíz de los dientes así como las estructuras que participan. Finalmente, presenta las alteraciones bucodentales más comunes en neonatos como perlas de Epstein
This document provides an overview of pharyngeal arch derivatives. It defines key terms and describes the development of the pharyngeal arches, pouches, and clefts during the fourth and fifth weeks of embryological development. The pharyngeal arches give rise to many structures in the head and neck, including muscles, bones, arteries and nerves. Derivatives of the arches include parts of the jaw, ear bones, hyoid bone and laryngeal cartilages. Persistence of pharyngeal pouches and clefts can lead to clinical issues such as branchial fistulae or cysts.
The document summarizes the development of the face from the 4th week of embryonic development. It discusses how the frontonasal process, maxillary processes, and mandibular processes form the structures of the face, including the lips, nose, eyes, ears, and palate. It also describes the development of branchial arches and how they contribute to specific muscles, nerves, arteries, and bones. The formation and differentiation of the pharyngeal pouches and clefts that form parts of the ear, thyroid, parathyroid glands and thymus are also outlined.
The development of the head and neck is characterized by the formation of pharyngeal arches and pouches. The pharyngeal arches give rise to muscles, bones and cartilage in the head and neck region. Neural crest cells migrate into the arches and contribute to skeletal development. The pharyngeal pouches form important structures such as the ears, tonsils, thyroid and parathyroid glands. Congenital defects can occur if development of the arches, pouches or neural crest cells is disrupted.
1. The cranial end of the embryo folds first due to the rapid growth of the brain, forming the primitive oral cavity and stomatodeum.
2. The face develops from five mesodermal elevations called processes that are augmented by neural crest cells and lined with ectoderm. These include the frontonasal process, two maxillary processes, and two mandibular processes.
3. The frontonasal process forms the forehead and nose. The maxillary processes form parts of the upper lip, cheek, and palate. The mandibular processes merge to form the lower lip and chin.
The pharyngeal arches develop in the fourth week as neural crest cells migrate into the head and neck region. Four pairs of pharyngeal arches form externally by the end of the fourth week. Each arch contains mesenchyme, ectoderm, endoderm, an aortic arch, nerve, cartilage, and muscles. The arches give rise to many structures in the head and neck through their derivatives. Pharyngeal pouches and clefts also form and contribute to various structures such as the parathyroid glands, thymus, and thyroid gland. Anomalies can occur in the development of these structures.
The document discusses the development of the pharyngeal arches and their derivatives. There are 6 pharyngeal arches that develop around the pharynx in successive order. Each arch consists of an outer ectoderm layer, inner endoderm layer, and middle mesoderm layer. The 5 pairs of pharyngeal arches give rise to many important structures of the head and neck, including muscles, bones, arteries and nerves. Derivatives of each arch are listed, such as how the first arch forms parts of the mandible and maxilla. Between the arches are pharyngeal grooves externally and pouches internally that form other structures like the palatine tonsil.
This document provides an overview of the normal development of the branchial arches and pouches during embryogenesis. It discusses the components and derivatives of each of the first four branchial arches and pouches, including the muscles, nerves, arteries and skeletal structures derived from each. It also briefly outlines some anomalies that can occur due to abnormal development, such as Treacher Collins syndrome which affects structures from the first and second branchial arches.
The document summarizes the development of the face from the 4th week of embryonic development. It discusses how the frontonasal prominence, maxillary prominences, and mandibular prominences form the basic structures of the face. It describes the development of specific structures like the nose, palate, ears, eyes, lips, and tongue from these prominences. It also discusses the theories of craniofacial growth and the role of the pharyngeal arches, pouches, grooves, and clefts in facial development.
The nasopharynx is located behind the nasal cavities and above the soft palate. Its roof is formed by the base of the skull, and its walls connect it to surrounding structures like the Eustachian tubes. It continues below into the oropharynx. During swallowing, the soft palate and palatopharyngeal sphincter close off the nasopharynx from the oropharynx. Mucosal folds in the nasopharynx mark locations like the openings of the Eustachian tubes.
The document summarizes head and neck development from the 4th to 6th week of gestation. It describes the formation of pharyngeal arches and pouches which contribute to structures in the neck and head region like muscles, bones and glands. It also discusses the development of specific structures like the face, tongue, teeth and palate from proliferations in the pharyngeal arches and prominences.
pharyngeal arches and pouches responsible for the development of head and neck including it's muscular development, neural development, vascular and skeletal development
Birth defect system according to System wise in that Respiratory System Birth...sonal patel
Birth defect system according to System wise in that Respiratory System Birth defect, Cardiovascular System Birth defect,Digestive System Birth defect, Extremity Birth defect made by sonal Patel
Embryology is necessary to understand the growth of various anatomical structures pertinent to orthodontics and will help understand the anomalies associated with its maldevelopment.
The head and neck develop from contributions of all three germ layers and the neural crest. The pharyngeal arches give rise to many structures in the head and neck region. There are five pharyngeal arches that form sequentially from week 4 onwards, with each arch containing arteries, cartilage, nerves, and muscles. The arches contribute to forming the face, tongue, jaws, palate, and neck. Sensory placodes also form in the head region and will later develop into components of the senses. Skull development involves the chondrocranium, cranial vault, and calvaria forming from different tissues.
The pharyngeal arches develop in the foregut wall as rod-like mesodermal thickenings between the 4th and 5th weeks. Six arches form initially but the 5th disappears, leaving five. Each arch contains skeletal, muscular, nervous and vascular components. The arches contribute to structures of the head and neck. Between the arches, endodermal pouches form into the pharynx while ectodermal clefts form opposite. This process accounts for the development of many head and neck structures including muscles, bones and organs.
The document summarizes the development of the ear from the early stages of formation through maturation. It describes:
- The formation of the otic placode from surface ectoderm, which then invaginates to form the otic vesicle.
- How the otic vesicle develops into the inner, middle, and outer ear structures. The inner ear forms from regionalization of the vesicle directed by homeobox genes.
- The development of the middle ear bones and structures from the pharyngeal arches. The external ear develops from auricular hillocks that fuse to form the pinna.
- Key processes like differentiation of hair cells and formation of the bony labyrinth that
The document discusses prenatal development of the face, beginning with formation of the pharyngeal arches and facial prominences in the early embryo. It describes how the maxilla and mandible develop from the first pharyngeal arch. Ossification begins slightly earlier in the mandible. Prenatal growth involves remodeling and reshaping of structures. Postnatally, the mandible grows primarily through deposition at the condyle and ramus. The maxilla is attached to the cranial base and its position depends on cranial growth.
The tongue develops from the floor of the pharynx beginning in the 4th week of gestation. The anterior two-thirds develops from swellings in the first pharyngeal arch, while the posterior one-third develops from the second, third, and part of the fourth arches. The thyroid gland develops as an epithelial proliferation in the floor of the pharynx between the fifth and seventh weeks and descends to its final location in front of the trachea by the seventh week. The development of the tongue, thyroid gland, and associated structures can result in congenital anomalies if development is disrupted.
Similar to phayrangeal apparatus By Dr.Aisha Sadaf IBMS -KMU-peshawar (20)
phayrangeal apparatus By Dr.Aisha Sadaf IBMS -KMU-peshawar
1.
2. INTRODUCTION
After folding, the secondry yolk sac inside
the embryo gives rise to:Fore gut-Mid gut–hind gut.
The fore gut is divided into :
a. Cranial part : extends from oral
membrane to the laryngo-tracheal groove.
It gives rise to :
Part of mouth cavity
Salivary glands
Pharyngeal apparatus
Respiratory system
b. Caudal part : begins distal to the laryngotracheal groove.
It gives rise to: esophagus-stomach- part of duodenum-
liver-biliary system –pancreas.
Amniotic
cavity
Oral
membrane
Gut
Cloacal
membrane
Yolk sac
Before folding
Stomodeum
Vitello-intestinal
duct
Allantois Cloacal
membrane
Hindgut
Midgut
Foregut
Connecting stalk
Amniotic cavity
After folding
3. THE PHARYNGEAL ARCHES
They are 6 curved cylindrical mesenchymal
thickening on each side of the primitive pharynx.
They develop in the head & neck similar in origin &
structure to gills of the fish.
Gill = Branchia
Each arch consists of :
1. Outer ectodermal covering
2. Inner endodermal lining
3. Mesodermal core
4. Each pharyngeal arch consists, at first of
mesenchyme derived from the lateral plate
mesoderm.
Soon, neural crest cells migrate into the
pharyngeal arches and surround the central
core of mesenchymal cells.
Migration of neural crest cells into the arches
produce discrete swelling demarcating each of
the pharyngeal arch.
NB. Mesenchyme =connective tissue of embryo
The mesenchyme derived from neural crest
cells is called (ectomesenchyme) to
differentiate it from mesenchyme derived
from mesoderm.
5. A typical pharyngeal arch
contains:
1- A cartilaginous rod that forms
the skeleton of the arch.
2- A muscular component that
differentiates into muscles in the
head and neck.
3- An aortic arch , an artery that
arises from the truncus arteriosus
of the primordial heart.
4- A nerve that supplies the
mucosa and muscles derived from
the arch.
6. NERVE SUPPLY OF THE PHARYNGEAL ARCHES
It is derived from the
hindbrain (pons and
Medola oblogata)
Each arch receives
mixed nerve.
Its motor branch
supplies muscles derived
from the arch.
Its sensory branch
supplies skin and
mucous membrane of
the arch.
7. DEVELOPMENT OF PHARYNGEAL ARCHES
•By the end of the 4th week, 4 well defined pairs of pharyngeal arches
are visible externally.
•The 5th and 6th arches are small and cannot be seen on the surface of
the embryo.
8. Most of the cartilages that form within the
pharyngeal arches develop from the neural crest of
the midbrain and hindbrain regions, although the
cartilages of arches 4 and 6 apparently develop from
lateral plate mesoderm.
The first pharyngeal arch is remodeled to form a
cranial maxillary process and a caudal mandibular
process.
Each process contains a central cartilaginous element
(the maxillary is known as palato-pterygo-quadrate
cartilage and the mandibular is known as Meckel's
cartilage) surrounded by a mesenchymatic tissue.
Cartilages
10. P R O F . M O H A M E D . A . A U T I F I
Arch Skeletal
Derivatives
Muscular
Derivatives
Vascular
Element
Nerve
First arch
(mandibular
arch)
Consists of
maxillary
process
and
mandibular
process
Maxillary process
gives rise to:
1. Maxilla
2. Zygomatic
bone
3. Squamous part
of temporal
bone
Mandibular
process
differentiates into :
1. Malleus
2. Incus
3. Anterior
ligament of
malleus
4. Spheno-
mandibular
ligament
5. Mandible
1.Muscles of
Mastication
2.Tensor
palati
3.Tensor
tympani
4. Mylohoid
5. Anterior
belly of
digastric
1. Maxillary
artery
Mandibular
nerve (V)
11. Derivatives of Cartilages of First Pharyngeal Arch
The ventral part of the
first arch cartilage (
Meckel cartilage ) form
primordium of the
mandible
The middle part of
cartilage forms anterior
ligament of malleus and
sphenomandibular
ligament
The dorsal end of first
arch cartilage
ossifies to form
malleus and incus
More details about cartilages
12. P R O F . M O H A M E D . A . A U T I F I
Arch Skeletal
Derivatives
Muscular
Derivatives
Vascular
Element
Nerve
Second arch
(Hyoid arch)
Reichert’s
cartilage:
Differentiates
into:
1. Stapes
2. Styloid
process
3. Stylohyoid
ligament
4. LeSser horn
of the hyoid
bone
5. Superior(Uppe
r)part of body
of hyoid bone
1. Muscles of
the scalp
and face
2. Platysma
3. Stylohyoid
4. Stapedius
5. Posterior
belly of
digastric
Stapedial
Artery
tympanic br.
of ICA)
Facial nerve
(VII)
13. Derivatives of Cartilage of second Pharyngeal Arch
The ventral end of second arch
cartilage (Reichert cartilage)
ossifies to form the lesser cornu
and upper part of the body of
the hyoid bone
The dorsal end of second arch
cartilage (Reichert cartilage)
ossifies to form the stapes,
styloid process and stylohyoid
ligament
14. Arch Skeletal
derivatives
Muscular
derivatives
Vascular
Element
Nerve
Third arch 1. Greater horn of
hyoid bone
2. Lower part of
body of hyoid bone
Stylopharyngeus 1. I.C.A
2. C.C.A
Glossopharyngeal
nerve (IX)
Fourth arch Thyroid cartilage Cricothyroid 1. Arch of aorta
on left side
2. Subclavian A
on right side
Superior laryngeal
nerve (X)
Sixth arch Rest of Cartilages
of the larynx except
epiglottis:
-Cricoid,
-Arytenoid,
-Corniculate
and
-Cuneiform.
NB. The epiglottis
develops from
mesenchyme in
hypobrancheal
eminence
1. Other intrensic
muscles of larynx
2. Constrector
muscles of pharynx
except
Stylopharyngeus
3. Muscles of
palate except
tensor palati
1. Pulmonary A
on each sides
2. Ductus
arteriosus
on left side
Recurrent laryngeal
nerve (X)
15. Derivatives of Third Pharyngeal Arch Cartilage
The third arch cartilage ossifies to
form the greater cornu and the
lower part of the body of the hyoid
bone
16. • The fourth and sixth arch
cartilages fuse to form the
laryngeal cartilages except
epiglottis which develops
from hypobrancheal
eminence
• The fifth pharyngeal arch
is rudimentary and
disappear later and has no
derivatives
Derivatives of The fourth and sixth Pharyngeal Arch
Cartilages
20. PHARYNGEAL POUCHES
The pharyngeal pouches are balloon-like diverticula that
formed on the endodermal side between the pharyngeal
arches
The pairs of pouches develop in a craniocaudal sequence
between the arches.
The first pair of pouches lies between the first and second
pharyngeal arches.
There are four well defined pairs of pharyngeal pouches
The fifth pair is absent or rudimentary
•
21. It gives rise to
tubotympanic recess
which forms:
1.Tympanic cavity
2.Auditory tube.
(pharyngotympanic
tube or Eustachian
tube)
First pouch
22. • Gives rise to palatine tonsils
• -Early in 3rd month, its lining
epithelium proliferates ➪
solid tonsillar buds which
grow into underlying
mesoderm.
• -Their central cells
degenerate➪ hollow tonsillar
crypts.
• -Crypts & surrounding
mesoderm ➪ palatine tonsils.
• -Lymphatic tissue infiltrates
its mesoderm during 3-5
Month
• -Tonsillar capsule formed by
condensed mesoderm.
• -Remnants of pouch ➪
intratonsillar cleft
Second pouch
23. Gives rise to:
-inferior parathyroid glands.
-thymus gland.
At 6th week, they lose connection to
pharyngeal wall.
-Thymus gland migrates caudally &
medially, pulling the parathyroid. The two
thymic rudiments descend into
thorax. Gland is large at time of birth, ➚
up to 2nd year, little ➚ until 7th year,
rapid growth to 11th year,
then ➘ to adult weight (12-15 gm)
-Inferior parathyroid glands descends
to lower pole of thyroid gland
Third pouch
24. It gives rise to:
1.Superior parathyroid glands.
It migrates with the thyroid gland.
2. Ultimo-branchial
body.
It incorporates into the thyroid
gland.
It gives parafollicular or C cells of
thyroid gland
Fourth pouch
25. PHARYNGEAL GROOVES
(CLEFTS):
In the 5th week: 4 clefts seen.
The first cleft gives:
external auditory meatus.
The epithelium of the bottom
forms outer layer of eardrum
NB. Active growth of 2nd arch
mesoderm overlaps 3rd & 4th
arches.
Temporarily, clefts ➪ectodermal
cavity, cervical sinus, which
disappears later.
29. 1. Branchial Cyst: Sinus persists as cyst along ant border
of sternomastoid muscle.
If ruptures ➪ branchial sinus
2. Branchial Sinus:
a) External: Cyst opens outside, usually anterior to
sternomastoid.
b) Internal: Cyst opens
into pharynx,usually
in the tonsillar region.
3. Cervical Fistula:
Sinus opens externally
& internally, connects
pharynx with outside.
Congenital anomalies
30. 4. 1st Arch Syndrome (Mandibulofacial dystosis)
Maldevelopment of components of 1st pharyngeal arch results
in various congenital malformations of eyes, ears, mandible
and palate. This is due to failures of Proper neural crest
migration into the 1st branchial arches.
5. DiGeorge Syndrome. Improper migration of neural crest
cells into the 3rd and 4th branchial arches.
It is characterized by:
1.Minor deformations of the lower face.
2.Thymic and parathyroid aplasia (i.e., no thymus and no
parathyroids). The absence of a thymus has a very deleterious effect on the
development of the immune system. The absence of parathyroids leads to
hypocalcemia.
3.Problems with aorticopulmonary septation.
Congenital anomalies
31. 6. Ectopic Thymic Tissue:
Thymus gland lies in the neck.
7. Ectopic Parathyroid:
Inferior parathyroid may present at bifurcation of
Common carotid artery.
Congenital anomalies