The nose and paranasal sinuses develop from the frontonasal process. The nose has external and internal structures. Externally, cartilage and bone provide structure, while internally the nasal cavities contain three turbinates and three meatuses on each side. The paranasal sinuses include the frontal, ethmoid, maxillary, and sphenoid sinuses. The sinuses are lined with ciliated respiratory epithelium and contain ostia that drain into the nasal cavities. The nose and sinuses receive blood supply from the external and internal carotid arteries and are innervated by branches of the trigeminal and facial nerves. Lymphatic drainage occurs to local cervical nodes.
The document discusses the anatomy and development of the nose and paranasal sinuses. It describes how the nose develops from embryonic structures and the formation of the nasal cavity, septum, and external nose. It then covers the anatomy of the different areas of the nose in detail, including the vestibule, muscles, bones/cartilages, blood supply, nerves and lymphatic drainage. Finally, it discusses the anatomy of each paranasal sinus, including the sphenoid sinus and its variations in pneumatization.
The document discusses the paranasal sinuses and provides details about their types, anatomy, development, clinical considerations, and functional importance. There are four pairs of paranasal sinuses: maxillary, frontal, sphenoidal, and ethmoidal. The maxillary sinus is the largest and its development begins in the first trimester. Issues like sinusitis, developmental anomalies, dental infections, and trauma can affect the paranasal sinuses clinically. The sinuses have functions like resonance, surface area increase, air filtration and warming.
The document discusses the paranasal sinuses and their clinical considerations. It begins by introducing the four pairs of paranasal sinuses - maxillary, frontal, sphenoidal, and ethmoidal sinuses. For each sinus, it describes the anatomy, development, neurovascular supply, and other key details. It then covers the functional importance of the sinuses and common clinical issues like sinusitis, developmental anomalies, dental issues that could impact the sinuses, and more. The document provides an overview of the paranasal sinuses and factors relevant to their examination and treatment.
Anatomy Of Nose And Paranasal Sinuses - Copy.pptxHtet Ko
This document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal nasal cavities and walls. It also outlines the blood supply, nerves, lymphatic drainage and mucous membrane of the nose. Finally, it provides details on each of the four paranasal sinuses, including their locations, relations and functions.
The document discusses the anatomy of the nose and paranasal sinuses. It describes the structures of the external nose including the vestibule, septum, lateral wall, roof and floor. It then covers the four main paranasal sinuses - maxillary, ethmoid, frontal, and sphenoid sinuses - describing their locations, drainage pathways, and key relationships to surrounding structures. Finally, it discusses the blood supply, lymphatic drainage and functions of the nasal cavity and paranasal sinuses.
1. The nose is divided into an external pyramidal part made of bone and cartilage, and an internal nasal cavity divided by the nasal septum.
2. The external nose contains upper lateral, lower alar, and septal cartilages that provide structural support. The internal nasal cavity contains three turbinates that project from the walls.
3. The nasal cavity is divided into the anterior vestibule lined by skin and the mucosa-lined nasal cavity proper containing the olfactory region and respiratory region with pseudostratified epithelium. Various structures like the uncinate process and bulla ethmoidalis are related to sinus drainage and surgery.
The document discusses the anatomy and development of the nose and paranasal sinuses. It describes how the nose develops from embryonic structures and the formation of the nasal cavity, septum, and external nose. It then covers the anatomy of the different areas of the nose in detail, including the vestibule, muscles, bones/cartilages, blood supply, nerves and lymphatic drainage. Finally, it discusses the anatomy of each paranasal sinus, including the sphenoid sinus and its variations in pneumatization.
The document discusses the paranasal sinuses and provides details about their types, anatomy, development, clinical considerations, and functional importance. There are four pairs of paranasal sinuses: maxillary, frontal, sphenoidal, and ethmoidal. The maxillary sinus is the largest and its development begins in the first trimester. Issues like sinusitis, developmental anomalies, dental infections, and trauma can affect the paranasal sinuses clinically. The sinuses have functions like resonance, surface area increase, air filtration and warming.
The document discusses the paranasal sinuses and their clinical considerations. It begins by introducing the four pairs of paranasal sinuses - maxillary, frontal, sphenoidal, and ethmoidal sinuses. For each sinus, it describes the anatomy, development, neurovascular supply, and other key details. It then covers the functional importance of the sinuses and common clinical issues like sinusitis, developmental anomalies, dental issues that could impact the sinuses, and more. The document provides an overview of the paranasal sinuses and factors relevant to their examination and treatment.
Anatomy Of Nose And Paranasal Sinuses - Copy.pptxHtet Ko
This document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal nasal cavities and walls. It also outlines the blood supply, nerves, lymphatic drainage and mucous membrane of the nose. Finally, it provides details on each of the four paranasal sinuses, including their locations, relations and functions.
The document discusses the anatomy of the nose and paranasal sinuses. It describes the structures of the external nose including the vestibule, septum, lateral wall, roof and floor. It then covers the four main paranasal sinuses - maxillary, ethmoid, frontal, and sphenoid sinuses - describing their locations, drainage pathways, and key relationships to surrounding structures. Finally, it discusses the blood supply, lymphatic drainage and functions of the nasal cavity and paranasal sinuses.
1. The nose is divided into an external pyramidal part made of bone and cartilage, and an internal nasal cavity divided by the nasal septum.
2. The external nose contains upper lateral, lower alar, and septal cartilages that provide structural support. The internal nasal cavity contains three turbinates that project from the walls.
3. The nasal cavity is divided into the anterior vestibule lined by skin and the mucosa-lined nasal cavity proper containing the olfactory region and respiratory region with pseudostratified epithelium. Various structures like the uncinate process and bulla ethmoidalis are related to sinus drainage and surgery.
The summary of the document is:
1. The nose and paranasal sinuses develop between 4-8 weeks of fetal life from the frontonasal process and maxillary processes.
2. By 5-6 weeks, nasal placodes form and invaginate to form nasal pits which later fuse to form the primitive nasal cavity.
3. Between 7-10 weeks, the paranasal sinuses begin to form from outpocketings of the nasal mucosa. The maxillary sinus is the first to form around 3 months of gestation.
4. The external nose is made up of bones, cartilages and overlying skin and muscle. The internal nasal cavity has
The Respiratory System in the Head and NeckHadi Munib
The document describes the anatomy and structures of the respiratory system in the head and neck region, including the nose, nasal cavity, paranasal sinuses, pharynx, and larynx. It discusses the external features, internal structures, blood supply, nerve innervation, and functions of these areas. The nasal cavity is divided by the septum and contains three meatuses for drainage of the paranasal sinuses. The larynx contains cartilages like the thyroid and cricoid that support the vocal cords.
The nose develops from the frontonasal process and surrounding structures in the embryo. It has bony and cartilaginous components that provide structure. The nasal cavities contain three turbinates and three meatuses for drainage. The paranasal sinuses develop later in life and include the maxillary, ethmoid, frontal, and sphenoid sinuses. The sinuses are lined with mucous membrane and have ostia that drain into the meatuses. The nose has important functions including warming, humidifying, and filtering air as well as roles in smell and voice resonance.
The nose and paranasal sinuses develop from neural crest cells and mesoderm that proliferate to form the nasal placodes and prominences. This results in the formation of the nasal cavity and associated structures.
The nose has an external pyramidal portion made of bone and cartilage and an internal nasal cavity lined by different types of mucosa and divided by the nasal septum. The nasal cavity connects to the paranasal sinuses and drains into the nasopharynx. The maxillary sinus is the largest paranasal sinus located within the maxilla.
The document summarizes the anatomy and functions of the pharynx. It is a fibromuscular tube approximately 12-14 cm long located behind the nasal cavity, mouth, and larynx. It functions in respiration, swallowing, and sound resonance. The pharynx has three parts - nasopharynx, oropharynx, and laryngopharynx. Its walls consist of mucosa, pharyngeal aponeurosis, a muscular coat with three constrictor muscles, and an outer buccopharyngeal fascia. The pharynx is supplied by branches of the vagus and glossopharyngeal nerves and drains into deep cervical lymph nodes.
This document summarizes the anatomy of the nose. It describes the external structures like skin, cartilage, and bones that make up the nose. It then details the internal nasal anatomy including the nasal septum, lateral walls, and turbinates. It discusses the blood supply, nerves, and lymphatic drainage of the nose. The document emphasizes surgical implications for structures like the nasal skin, cartilage, and septum to help surgeons perform reconstructive nasal surgery.
The document summarizes the anatomy of the nose and paranasal sinuses. It describes the external nose, nasal cavity, paranasal sinuses, blood supply, nerve supply, and functions of the nose. The external nose has a bony and cartilaginous framework that provides structure. Internally, the nasal cavity is divided by the nasal septum and contains the paranasal sinuses which include the maxillary, frontal, ethmoid, and sphenoid sinuses. The nose functions include filtration, warming and humidifying air, olfaction, and vocal resonance.
Cross Sectional Anatomy of Paranasal sinus Sarbesh Tiwari
The document summarizes the anatomy and variations of the paranasal sinuses. It describes the locations and openings of the different sinus groups. Key anatomical structures involved in sinus drainage like the osteomeatal complex are also explained. Common anatomic variations seen on imaging that can affect sinus drainage are discussed. These variations include concha bullosa, Haller cells, Onodi cells and pneumatization of surrounding bones.
Anatomy of Nose And Paranasal Sinuses - Copy.pptxHtet Ko
The document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal structures including the walls, roof, and floor of the nasal cavities. It also summarizes the blood supply, nerve supply, lymphatic and mucosal drainage of the nose. Finally, it provides details on each of the four paranasal sinuses including their locations, relations to surrounding structures, and functions.
The document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal structures including the walls, roof, and floor of the nasal cavities. It also summarizes the blood supply, nerve supply, lymphatic drainage and mucous membrane of the nose and paranasal sinuses. Finally, it provides details on each of the individual paranasal sinuses including their locations, relations to surrounding structures, and functions.
The oral cavity contains the lips, cheeks, gums, teeth, tongue, and floor and roof of the mouth. It leads posteriorly into the oropharynx. The tongue has papillae and muscles that aid in functions like taste, speech, and swallowing. The pharynx is a muscular tube divided into nasopharynx, oropharynx, and laryngopharynx that functions as a common passage for food and air and connects the oral and nasal cavities to the esophagus and larynx.
The document provides information on the nose, nasal cavity, paranasal sinuses, and pharynx. It describes the boundaries and structures of the nasal cavity including the nasal septum, nasal conchae and meati. It discusses the paranasal sinuses, their locations and functions. It also describes the three parts of the pharynx and identifies the muscles and structures found in each part.
The nose and paranasal sinuses develop between the 4th and 8th weeks of gestation from five facial swellings. By the 5th week, nasal placodes appear and invaginate to form nasal pits. The medial nasal processes fuse to form the nasal septum. The lateral nasal processes form the lateral nasal walls and turbinates. By the 9th week, the definitive nasal cavity and oral cavity are formed. The paranasal sinuses develop as outpocketings of the lateral nasal walls and include the maxillary, frontal, ethmoid and sphenoid sinuses. Each sinus has distinct anatomical features and relationships. The mucous membrane lining the sinuses and nasal cavity is respiratory type epithelium
This document provides an overview of the anatomy of the paranasal sinuses. It discusses the four main sinuses - maxillary, frontal, ethmoid, and sphenoid sinuses. For each sinus it describes the location, size, drainage pathways, blood supply, nerve supply, clinical importance and key anatomical relationships. The ethmoid sinus is noted to be the most variable with 3-18 cells on each side that can pneumatize into surrounding bones. Understanding the anatomy of the paranasal sinuses is important for sinus surgery and procedures.
The document provides an overview of the nose, paranasal sinuses, and ear. It describes the external nose, nasal cavity, and paranasal sinuses which include the maxillary, frontal, sphenoid, and ethmoid sinuses. It then discusses the external, middle, and inner ear. The middle ear contains the auditory ossicles and tympanic membrane, while the inner ear houses the organs of hearing and balance within the bony labyrinth.
The document provides details on the anatomy of the internal nose. It describes how the nasal cavity is divided into right and left cavities by the nasal septum. Each cavity has a skin-lined vestibule and mucosa-lined nasal cavity proper. The vestibule contains hair follicles and sebaceous glands. The document further describes the structures that make up the lateral wall of the nose such as the turbinates, meatuses, osteomeatal complex and its related structures. It also discusses the blood supply, nerve supply, lymphatic and venous drainage of the internal nose.
The nose develops from embryonic tissues and is formed by the fusion of various processes. It has a bony skeletal framework in the upper third and a cartilaginous framework in the lower two-thirds. The nasal cavity contains the nasal septum dividing it into left and right sides, with lateral walls containing turbinates that project into the airway. The paranasal sinuses develop in surrounding bones and drain into the nasal cavity. The nose has complex vascular, lymphatic and nerve supply from surrounding structures.
The mediastinum is the region within the chest between the lungs containing the heart and other thoracic organs. It is divided into superior, anterior, middle and posterior compartments. Common tumors of the mediastinum include thymomas in the anterior-superior compartment, lymphomas throughout and neurogenic tumors in the posterior compartment. Thymomas are often asymptomatic but can cause chest pain, dyspnea and superior vena cava obstruction. Diagnosis is made through imaging like CT and biopsy. Treatment is surgical resection with chemotherapy or radiation for advanced stages. Retrosternal goiters are usually secondary extensions from the neck but can also be primary. They may cause compressive symptoms and require surgical removal.
Day surgery offers advantages for both patients and healthcare providers by reducing disruption and costs compared to overnight stays. Success requires efficient coordination across admission, the procedure itself, recovery, and safe discharge within 12 hours. Selection criteria evaluate medical fitness, social support, and whether the planned procedure is suitable for day surgery. Preoperative assessment optimizes patient health while clear discharge standards ensure recovery before leaving. Common day surgery procedures involve areas like abdominal, breast, orthopedic, and vascular operations. Emergency minor cases can also sometimes be managed with same-day admission and discharge.
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Similar to Anatomy of Nose & Paranasal sinuses.pptx
The summary of the document is:
1. The nose and paranasal sinuses develop between 4-8 weeks of fetal life from the frontonasal process and maxillary processes.
2. By 5-6 weeks, nasal placodes form and invaginate to form nasal pits which later fuse to form the primitive nasal cavity.
3. Between 7-10 weeks, the paranasal sinuses begin to form from outpocketings of the nasal mucosa. The maxillary sinus is the first to form around 3 months of gestation.
4. The external nose is made up of bones, cartilages and overlying skin and muscle. The internal nasal cavity has
The Respiratory System in the Head and NeckHadi Munib
The document describes the anatomy and structures of the respiratory system in the head and neck region, including the nose, nasal cavity, paranasal sinuses, pharynx, and larynx. It discusses the external features, internal structures, blood supply, nerve innervation, and functions of these areas. The nasal cavity is divided by the septum and contains three meatuses for drainage of the paranasal sinuses. The larynx contains cartilages like the thyroid and cricoid that support the vocal cords.
The nose develops from the frontonasal process and surrounding structures in the embryo. It has bony and cartilaginous components that provide structure. The nasal cavities contain three turbinates and three meatuses for drainage. The paranasal sinuses develop later in life and include the maxillary, ethmoid, frontal, and sphenoid sinuses. The sinuses are lined with mucous membrane and have ostia that drain into the meatuses. The nose has important functions including warming, humidifying, and filtering air as well as roles in smell and voice resonance.
The nose and paranasal sinuses develop from neural crest cells and mesoderm that proliferate to form the nasal placodes and prominences. This results in the formation of the nasal cavity and associated structures.
The nose has an external pyramidal portion made of bone and cartilage and an internal nasal cavity lined by different types of mucosa and divided by the nasal septum. The nasal cavity connects to the paranasal sinuses and drains into the nasopharynx. The maxillary sinus is the largest paranasal sinus located within the maxilla.
The document summarizes the anatomy and functions of the pharynx. It is a fibromuscular tube approximately 12-14 cm long located behind the nasal cavity, mouth, and larynx. It functions in respiration, swallowing, and sound resonance. The pharynx has three parts - nasopharynx, oropharynx, and laryngopharynx. Its walls consist of mucosa, pharyngeal aponeurosis, a muscular coat with three constrictor muscles, and an outer buccopharyngeal fascia. The pharynx is supplied by branches of the vagus and glossopharyngeal nerves and drains into deep cervical lymph nodes.
This document summarizes the anatomy of the nose. It describes the external structures like skin, cartilage, and bones that make up the nose. It then details the internal nasal anatomy including the nasal septum, lateral walls, and turbinates. It discusses the blood supply, nerves, and lymphatic drainage of the nose. The document emphasizes surgical implications for structures like the nasal skin, cartilage, and septum to help surgeons perform reconstructive nasal surgery.
The document summarizes the anatomy of the nose and paranasal sinuses. It describes the external nose, nasal cavity, paranasal sinuses, blood supply, nerve supply, and functions of the nose. The external nose has a bony and cartilaginous framework that provides structure. Internally, the nasal cavity is divided by the nasal septum and contains the paranasal sinuses which include the maxillary, frontal, ethmoid, and sphenoid sinuses. The nose functions include filtration, warming and humidifying air, olfaction, and vocal resonance.
Cross Sectional Anatomy of Paranasal sinus Sarbesh Tiwari
The document summarizes the anatomy and variations of the paranasal sinuses. It describes the locations and openings of the different sinus groups. Key anatomical structures involved in sinus drainage like the osteomeatal complex are also explained. Common anatomic variations seen on imaging that can affect sinus drainage are discussed. These variations include concha bullosa, Haller cells, Onodi cells and pneumatization of surrounding bones.
Anatomy of Nose And Paranasal Sinuses - Copy.pptxHtet Ko
The document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal structures including the walls, roof, and floor of the nasal cavities. It also summarizes the blood supply, nerve supply, lymphatic and mucosal drainage of the nose. Finally, it provides details on each of the four paranasal sinuses including their locations, relations to surrounding structures, and functions.
The document provides an overview of the anatomy of the nose and paranasal sinuses. It describes the development of the nose from the frontonasal process. It then details the external structures of the nose including the bones and cartilages. It discusses the internal structures including the walls, roof, and floor of the nasal cavities. It also summarizes the blood supply, nerve supply, lymphatic drainage and mucous membrane of the nose and paranasal sinuses. Finally, it provides details on each of the individual paranasal sinuses including their locations, relations to surrounding structures, and functions.
The oral cavity contains the lips, cheeks, gums, teeth, tongue, and floor and roof of the mouth. It leads posteriorly into the oropharynx. The tongue has papillae and muscles that aid in functions like taste, speech, and swallowing. The pharynx is a muscular tube divided into nasopharynx, oropharynx, and laryngopharynx that functions as a common passage for food and air and connects the oral and nasal cavities to the esophagus and larynx.
The document provides information on the nose, nasal cavity, paranasal sinuses, and pharynx. It describes the boundaries and structures of the nasal cavity including the nasal septum, nasal conchae and meati. It discusses the paranasal sinuses, their locations and functions. It also describes the three parts of the pharynx and identifies the muscles and structures found in each part.
The nose and paranasal sinuses develop between the 4th and 8th weeks of gestation from five facial swellings. By the 5th week, nasal placodes appear and invaginate to form nasal pits. The medial nasal processes fuse to form the nasal septum. The lateral nasal processes form the lateral nasal walls and turbinates. By the 9th week, the definitive nasal cavity and oral cavity are formed. The paranasal sinuses develop as outpocketings of the lateral nasal walls and include the maxillary, frontal, ethmoid and sphenoid sinuses. Each sinus has distinct anatomical features and relationships. The mucous membrane lining the sinuses and nasal cavity is respiratory type epithelium
This document provides an overview of the anatomy of the paranasal sinuses. It discusses the four main sinuses - maxillary, frontal, ethmoid, and sphenoid sinuses. For each sinus it describes the location, size, drainage pathways, blood supply, nerve supply, clinical importance and key anatomical relationships. The ethmoid sinus is noted to be the most variable with 3-18 cells on each side that can pneumatize into surrounding bones. Understanding the anatomy of the paranasal sinuses is important for sinus surgery and procedures.
The document provides an overview of the nose, paranasal sinuses, and ear. It describes the external nose, nasal cavity, and paranasal sinuses which include the maxillary, frontal, sphenoid, and ethmoid sinuses. It then discusses the external, middle, and inner ear. The middle ear contains the auditory ossicles and tympanic membrane, while the inner ear houses the organs of hearing and balance within the bony labyrinth.
The document provides details on the anatomy of the internal nose. It describes how the nasal cavity is divided into right and left cavities by the nasal septum. Each cavity has a skin-lined vestibule and mucosa-lined nasal cavity proper. The vestibule contains hair follicles and sebaceous glands. The document further describes the structures that make up the lateral wall of the nose such as the turbinates, meatuses, osteomeatal complex and its related structures. It also discusses the blood supply, nerve supply, lymphatic and venous drainage of the internal nose.
The nose develops from embryonic tissues and is formed by the fusion of various processes. It has a bony skeletal framework in the upper third and a cartilaginous framework in the lower two-thirds. The nasal cavity contains the nasal septum dividing it into left and right sides, with lateral walls containing turbinates that project into the airway. The paranasal sinuses develop in surrounding bones and drain into the nasal cavity. The nose has complex vascular, lymphatic and nerve supply from surrounding structures.
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The mediastinum is the region within the chest between the lungs containing the heart and other thoracic organs. It is divided into superior, anterior, middle and posterior compartments. Common tumors of the mediastinum include thymomas in the anterior-superior compartment, lymphomas throughout and neurogenic tumors in the posterior compartment. Thymomas are often asymptomatic but can cause chest pain, dyspnea and superior vena cava obstruction. Diagnosis is made through imaging like CT and biopsy. Treatment is surgical resection with chemotherapy or radiation for advanced stages. Retrosternal goiters are usually secondary extensions from the neck but can also be primary. They may cause compressive symptoms and require surgical removal.
Day surgery offers advantages for both patients and healthcare providers by reducing disruption and costs compared to overnight stays. Success requires efficient coordination across admission, the procedure itself, recovery, and safe discharge within 12 hours. Selection criteria evaluate medical fitness, social support, and whether the planned procedure is suitable for day surgery. Preoperative assessment optimizes patient health while clear discharge standards ensure recovery before leaving. Common day surgery procedures involve areas like abdominal, breast, orthopedic, and vascular operations. Emergency minor cases can also sometimes be managed with same-day admission and discharge.
This document summarizes different types and causes of deafness. It discusses conductive hearing loss, which results from issues in the external ear, middle ear, or ear bones. Sensorineural hearing loss affects the inner ear or auditory nerve. Mixed hearing loss has both conductive and sensorineural components. Common causes of sensorineural hearing loss include genetic factors, noise exposure, certain medications, autoimmune disorders, sudden hearing loss, presbycusis, and nonorganic hearing loss. The document also covers deafness in children, which can have prenatal, perinatal, or postnatal causes such as genetic anomalies, infections, complications of prematurity, birth injuries, or postnatal illnesses/medications. Assessment methods like
This document defines communication and describes the communication cycle. Communication requires a sender and receiver. It is effective when the receiver understands the intended message. The communication cycle involves the sender encoding a message, sending it through a channel, the receiver decoding it, and providing feedback. There can be channel noise or semantic noise that interferes with understanding. Different types of communication include general, technical, intrapersonal, interpersonal, and mass communication.
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1. Surgery carries risks of complications that are increased in patients with preexisting medical conditions like diabetes, hypertension, ischemic heart disease, thyroid disease, and COPD.
2. Preoperative preparation and management of these conditions can reduce surgical risks, including optimizing glucose and blood pressure control, continuing medications, and addressing respiratory status.
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The inner ear consists of the bony labyrinth surrounded by fluid-filled membranous labyrinth containing the cochlea, vestibule and semicircular canals. The cochlea contains the organ of Corti which is the sensory organ for hearing and consists of hair cells. The vestibule and semicircular canals contain maculae and cristae which are sensory organs for balance. The inner ear develops from the otic placode and is complete by 16 weeks of gestation. The vestibulocochlear nerve transmits signals from the inner ear hair cells and sensory epithelia.
The lateral wall of the nose contains three bony projections called conchae or turbinates that increase the surface area for air conditioning. The lateral wall is formed by bones, cartilages, and soft tissues and separates the nose from the ethmoid sinuses above and the maxillary sinus below. The osteomeatal complex is an important drainage pathway consisting of the maxillary sinus ostium, ethmoid infundibulum, middle meatus, ethmoid bulla, and uncinate process. It drains the frontal and maxillary sinuses and anterior ethmoid cells. The lateral wall receives blood supply from the internal and external carotid arteries and drains venously and lymphatically. Sensation is provided by
Anatomy of Nasopharynx and Eustachian Tube.pptxHtet Ko
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The organ of Corti is located in the cochlea between the scala tympani and scala media. It is the sensory organ for hearing and contains hair cells that transduce sound vibrations into nerve impulses. The organ of Corti sits on the basilar membrane and contains three key cell types - inner and outer hair cells that detect sound, and supporting cells that provide structure. Inner hair cells transmit signals to the brain while outer hair cells modulate their function. Together, movement of the basilar membrane causes the hair cells to bend, opening ion channels and generating nerve impulses that are transmitted to the brain for interpretation as sound. The unique ion composition within the cochlea, maintained by
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9
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Date: May 29, 2024
Tags: Information Security, ISO/IEC 27001, ISO/IEC 42001, Artificial Intelligence, GDPR
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1. Anatomy Of Nose And Paranasal Sinuses
Capt. Pyae Sone Thu
PG 1, ORL-HNS
2. CONTENTS
1.Development of nose and paranasal sinuses
2.Anatomy of Nose
3.Anatomy of Paranasal Sinuses
4.Mucous membrane of Nose
5.Blood supply
6.Nerve Supply
7.Lymphatic Drainage
3. Develpoment of Nose and Paranasal Sinuses
•The nose develop from the frontonasal process which grows between the
primitive forebrain and stomodium.
•The frontonasal process gets divided into median nasal process and two
lateral processes.
•Primitive nasal cavities are closed at their posterior ends by bucconasal
membrane which rupture and forms posterior naries. If it fails to rupture,
it can result in choanal atresia.
4.
5. •Olfactory placodes on the frontonasal process become depressed to form the olfactory
pits which ultimately form the nasal cavity.
•Primitive nasal septum divides the nasal cavity in the midline and subsequently
definitive septum forms.
•Paranasal sinuses develop as the outpouching of nasal mucosa.
•Maxillary sinuses are present at birth but reach full development after the eruption of the
permanent dentition of related teeth.
•Rudimentary anterior ethmoidal sinuses are also present at birth.
6.
7. ANATOMY OF NOSE
The antomy of nose is divided into external nose and nasal cavities.
External Nose
•Pyramidal in shape and maintained by skeletal framework which divided into bony part
and cartilaginous part.
•Bony Part support the upper 1/3 of external nose and composed by nasal process of
frontal bone, nasal bone and ascending processes of maxillae.
•Cartilaginous Part support the lower 2/3 of external nose and which is composed of
upper lateral cartilage, lower lateral cartilages ( alar cartilages) and quadrilateral cartilage
of nasal septum.
8.
9.
10. ●Cartilages and bones are connected and covered by pericondrium and
periosteum.
●Skin over the upper part of the nose is thin and lower cartilaginous part is
thicker where it contains large sebaceous glands.
●Vestibule lined with skin and contain sebaceous glands and hairs
(vibrissae), situated in base of the nose, open downwards and separated
by columella.
●It is limited above and behind by a curved ridge, the limen nasi.
11. Nasal Fossae (Cavities)
●The right and left nasal fossae are separated by the nasal septum.
●The nasal fossae communicates with
– The paranasal sinuses, through their ostia.
– The nasopharynx, through their posterior choanae.
●Each nasal fossa if bounded by
1) Floor - palatine process of maxillae anterior ¾
- horizontal parts of palatine bones posterior ¼
12. 2) Roof - very narrow and formed by nasal process of
frontal bone (anteriorly), cribriform plate of ethmoid (fibers of olfactory
nerve pass through) and body of sphenoid bone (posteriorly).
3) Lateral wall - superior, middle and inferior (largest) turbinates
and three meatus lies below and lateral to the coresponding turbinates.
● Spheno-ethmoidal recess lies above the superior turbinate and recieves
the ostium of sphenoid sinus.
● Superior meatus contians ostia of the post. ethmoidal cells.
13.
14. ●Middle meatus is most complex and ostia of maxillary, anterior
ethmoidal and frontal sinuses open into it.
●The atrium is a forward continuation of the middle meatus.
●The aggar nasi is a curved ridge above the atrium.
●The bulla ethmoidalis is a smooth, rounded mass formed by the bulla or
above it.
●Inferior meatus receive the nasal opening of the nasolacrimal duct.
15.
16. Paranasal Sinuses
●The nasal accessory sinuses are air spaces which develop in the bones of skull and
communicate with the nasal cavity.
●Anterior group comprises
– Frontal sinus
– Maxillary sinus
– Anterior ethmoidal sinus
●Posterior group comprises
– Posterior ethmoidal sinus and Sphenoid sinus
17. Maxillary Sinus
●The largest sinus with an average capacity of about 15ml in adult.
●The fully developed maxillary sinus should extent from 1st premolar to the 3rd molar
tooth.
●Reaches up to floor of orbit and thus occupies practically the whole body of maxillary
bone.
●Medial boundry is lateral nasal wall with the attachment of inferior turbinate.
●Ostium lies in the membranous part of middle meatus and sometimes a small accessory
ostium below and in front of it.
18. ●Infraorbital nerve traverses the roof of the maxillary sinus and may partly
dehiscent.
●Floor is formed by alveolar process and hard palate.
●Covered with only thin plate of bone, in which reason for infection of
maxillary air sinus in apical tooth abscess become obvious.
●Posterior wall is pierced by dental canals and anterior wall extends as far as
forwards as the canine ridge.
● Lined by ciliated columnar epithelium and cilia constantly beat towards
this opening.
19. Relations
●Orbit is separated from antrum by thin roof of sinus which contain
infraorbital nerve.
●Upper part of the antrum is related to the middle meatus of the nose.
●Internal maxillary artery is related to the posterior wall and maxillary
division of V cranial nerve also transverse the pterygopalatine fossa.
●Nasolacrimal duct passes downwards, medial to the antrum to open into
the inferior meatus.
20.
21. Ethmoidal Sinus
●Consists of approximately 7 – 15 of thin-walled cavities within the lateral mass of the
ethmoid bones and sometimes in aggar nasi and middle turbinate.
●Contain very small air cells without regular dispositoin, symmetry or fixed number.
●Divided into two anatomical group -
1)Anterior – usually small and numerous, open into upper part of the hiatus
semilunaris and bulla ethmoidalis and drain into middle meatus
2)Posterior – large and few, open into superior meatus
22. ●The ethmoidal bulla is the most constant and largest cell in the anterior
ethmoid.
●The bulla is a two-dimensional space called the hiathu semilunaris and
leads into three-dimensional space of infundibulum.
●The most anterio-superior insertion of middle turbinate is called the
aggar nasi (in which there is usually an aerated cell).
●The middle section of the attachment of middle turbinate fixes it to the
lamina papyracea, it runs in a frontal plane and is called the ground
lamella, which defining border between anterior and posterior ethmoid.
23. Relations
●Anterior cranial fossa lies above and orbit is seprated by the orbital plate
of ethmoid bone.
●Lacrimal sac is related laterally to the anterior cell.
●Optive nerve is very close to the cell of the posterior group.
●Anterior and posterior ethmoidal vessels and nerve run from the orbit to
nasal fossa between the roof of ethmoidal sinus and under surface of
frontal bone.
24.
25. Frontal Sinus
●Occupies the space in the frontal bones between the inner and outer tables, an upward
extension of anterior ethmoidal cells.
●Not present at birth and developed about age of 5 and average capacity is about 7ml in
adult.
● Right and left sinuses are rarely symmetrical and seprated by thin bony plate.
●Frontal sinus may extend to outer orbital angle and upward into frontal bone for several
centimetres.
●Anterior cranial fossa lies its posterior wall and orbit lies below the floor of sinus and
skin periosteum of forehead cover the anterior.
26.
27. Sphenoidal Sinus
●Lies behind the upper part of the nasal fossa and average capacity is about
7ml.
●Two sphenoidal sinuses occupy the body of sphenoid bone and are rarely
symmetrical and separated by septum.
●Vary widely in size, shape and position, may be almost on top of the other.
●Mostly, pneumatisation extends inferiorly below the pituitary fossa, which
bulges into the sinus, surgically the trans-sphenoidal route to the pituitary
take advantage of this.
28. ●The ostium is situated in the upper part of anterior wall of sinuses and
communicates with the superior meatus indirectly through the
sphenoethmoidal recess.
●Relations
●Roof – pituitary gland, optic chisma, olfactory tract and frontal lobe of
brain
●Floor – Vidian nerve, vessels and nerve from sphenopalatine foramen lies
infront of lower part
29. ●Lateral – Cavernous sinus containing 3rd, 4th, 5th (opthalmic and
maxillary division) and 7th cranial nerves
●Posterior – Basilar artery and brain-stem
●Pterygopalatine fossa if situated between the posterior wall of maxillary
anteum anteriorly and pterygoid extension of greater wing of the sphenoid
posteriorly.
●It contains 3rd part of the maxillary artery, maxillary merve and
sphenopalatine ganglion.
30.
31. Mucous Membrane of Nose & Paranasal Sinuses
1) Respiratory
●Lines lower 2/3 of nasal septum and lateral wall of the nose below the superior turbinate
and floor of nasal fossa.
●Pink in colour and covered by ciliated columnar epithelium.
2) Olfactory
●Lines upper 1/3 of nasal septum, roof of nose and lateral wall, above and including
superior turbinate.
●Yellowish in colour and covered by non-ciliated columnar epithelium and contain serous
glands.
32. Blood Supply Of Nose & Paranasal Sinuses
Arterial Supply
Mainly supply by external and internal carotid arteries.
1) Branches of external carotid artery
i. Sphenopalatine artery; via internal maxillary artery
ii. Greater palatine artery; a branch of maxillary artery
iii. Superior labial artery; a branch of facial artery
iv. Infraorbital and superior dental ; branches of internal maxillary artery
v. Pharyngeal branch of internal maxillary artery
33.
34.
35. 2) Branches of internal carotid artery
i.Anterior and posterior ethmoidal arteries ; branches of the opthalmic artery
Venous Drainage
●The veins from cavernous plexus beneath the mucous membrane open into -
i. Sphenopalatine vein from the plexus
ii.Opthalmic veins from the ethmoidal veins
iii. Veins on the orbital surface of frontal lobe of brain through the foramina in
cribriform plate
iv. Superior sagittal sinus through foramen caecum
36.
37. Nerve Supply Of Nose
1) Branches of 5th Cranial Nerve
Anterior ethmoidal nerve, a branch of opthalmic 1st division, enters the
nasal cavity through anterior ethmoidal foramen and divided into
a) Medial branch which supplies the anterior part of the septum
b) Lateral branch which supplies anterior part od lateral wall of the nose
and anterior part of middle and inferior turbinates
38. 2) Branches of Sphenopalatine Ganglion
a) Greater palatine nerve which supplies most of the inferior turbinate and middle and
inferior meatus
b) Short sphenopalatine nerve which supplies the posterior part of superior and middle
turbinates
c) Long sphenopalatine nerve which supplies the remainder of the septum
3) Olfactory Nerve
● The sense of smell is supplied by 1st cranial nerve which pass through the foramina in
the cribriform plate and enter under surface of olfactory bulb.
39.
40. Lymphatic Drainage
●The lymphatic vessels arise from a continuous network in the superficial
part of the mucous membrane.
●Best developed at posterior end of superior turbinate.
●External nose and anterior part of nasal cavity drain into submendibular
lymphnodes.
●The rest of nasal cavity drain into upper deep cervical nodes either
directly of through retropharyngeal nodes.