The brainstem connects the spinal cord to the forebrain and consists of the midbrain, pons, and medulla oblongata stacked vertically. The midbrain contains nuclei that control eye movement and hearing. The pons contains nuclei that control facial muscles and hearing. The medulla oblongata contains cardiorespiratory centers and nuclei that control swallowing and tongue movement. Cranial nerves emerge from each region to innervate various structures. The brainstem plays a vital role in motor and sensory functions.
introduction to skull, parts of skull, bones involved forming skull, different views of skull, norma basalis, anterio cranial middle cranial and posterior cranial fossa, clinical aspects of cranial fossa, foramens present in the cranial fossa
This is the first lecture about the anatomy of the brainstem discussing the definition of the brainstem and the anatomical relations along with the external and internal parts (in general) and listing the major functions of brainstem. Then describing the medulla oblongata with its location, external and internal functions at different levels of sections. Lastly, this lectures discusses the most important clinical syndromes affecting the medulla oblongata.
introduction to skull, parts of skull, bones involved forming skull, different views of skull, norma basalis, anterio cranial middle cranial and posterior cranial fossa, clinical aspects of cranial fossa, foramens present in the cranial fossa
This is the first lecture about the anatomy of the brainstem discussing the definition of the brainstem and the anatomical relations along with the external and internal parts (in general) and listing the major functions of brainstem. Then describing the medulla oblongata with its location, external and internal functions at different levels of sections. Lastly, this lectures discusses the most important clinical syndromes affecting the medulla oblongata.
white fibers of the cerebrum, commissural fibers, association fibers and radiation fibers, examples of each types of cerebral fibers, corpus callosum, fornix, habenular commisure, anterior commissure, posterior commissure, superior longitudinal fasciculus, inferior longitudinal fasciculus, occipital fasciculus, uncinate fasciculus, projection fibers, corona radiata, optic radiation
BRAINSTEM
The Brainstem lies at the base of the brain and the top of the spinal cord.
The brainstem is located in the posterior cranial fossa.
The brainstem is the structure that connects the cerebrum of the brain to the spinal cord and cerebellum.
Provides a pathway for tracts running between higher and lower neural centers.
Divided into 3 major divisions:
midbrain,
pons, and
medulla oblongata.
It is responsible for many vital functions of life, such as breathing, consciousness, blood pressure, heart rate, and sleep.
It contains many critical collections of white and grey matter.
The grey matter within the brainstem consists of nerve cell bodies and form many important brainstem nuclei. Ten of the twelve cranial nerves arise from their cranial nerve nuclei in the brainstem.
The white matter tracts of the brainstem include axons of nerves traversing their course to different structures. These tracts travel both to the brain (afferent) and from the brain (efferent) such as the somatosensory pathways and the corticospinal tracts, respectively.
Mid Brain
The midbrain is continuous with the cerebral hemisphere.
The upper posterior (i.e. rear) portion of the midbrain is called the tectum, which means "roof."
The surface of the tectum is covered with four bumps representing two paired structures: the superior and inferior colliculi.
The superior colliculi are involved in eye movements and visual processing, while the inferior colliculi are involved in auditory processing.
Another important nucleus, the substantia nigra, is located here.
The substantia nigra is rich in dopamine neurons and is considered part of the basal ganglia.
Pons
An important pathway for tracts that run from the cerebrum down to the medulla and spinal cord, as well as for tracts that travel up into the brain.
It also forms important connections with the cerebellum via fibre bundles known as the cerebellar peduncles.
Posteriorly, the pons and medulla are separated from the cerebellum by the fourth ventricle.
Home to several nuclei for cranial nerves.
Medulla
The point where the brainstem connects to the spinal cord.
Contains a nucleus called the nucleus of the solitary tract that is crucial for our survival (receives information about blood flow, along with information about levels of oxygen and carbon dioxide in the blood, from the heart and major blood vessels).
When this information suggests a discordance with bodily needs (e.g. blood pressure is too low), there are reflexive actions initiated in the nucleus of the solitary tract to bring things back to within the desired range.
Blood Supply
The brain stem receives its blood supply exclusively from the posterior circulation, including the vertebrae and basilar artery.
The medulla receives its blood supply from the vertebral via medial and lateral perforating arteries.
The pons and midbrain receive their blood from the basilar via the medial and lateral perforating arteries.
Thalamus-Anatomy,Physiology,Applied aspectsRanadhi Das
Thalamus is a very important relay station.
All general and special sensory impulses (except smell) & afferent impulses from RAS are integrated here.
Thalamus however is the center of pain and protopathic sensations.
It has other non sensory functions as well, like motor control, sleep, wakefulness.
It is the largest structure deriving from the embryonic diencephalon, the posterior part of the forebrain situated between the midbrain and the cerebrum.
The thalamus is part of a nuclear complex structured of 4 parts, the hypothalamus, epithalamus, prethalamus (formerly called ventral thalamus) and dorsal thalamus.
Lateral ventricle of Brain. By Dr.N.Mugunthan.M.Smgmcri1234
Lateral ventricle of brain. Lecture by Dr.N.Mugunthan.
Associate Professor,
Mahatma Gandhi Medical College & Research Institute,
Sri Balaji Vidyapeeth, Pondicherry.
white fibers of the cerebrum, commissural fibers, association fibers and radiation fibers, examples of each types of cerebral fibers, corpus callosum, fornix, habenular commisure, anterior commissure, posterior commissure, superior longitudinal fasciculus, inferior longitudinal fasciculus, occipital fasciculus, uncinate fasciculus, projection fibers, corona radiata, optic radiation
BRAINSTEM
The Brainstem lies at the base of the brain and the top of the spinal cord.
The brainstem is located in the posterior cranial fossa.
The brainstem is the structure that connects the cerebrum of the brain to the spinal cord and cerebellum.
Provides a pathway for tracts running between higher and lower neural centers.
Divided into 3 major divisions:
midbrain,
pons, and
medulla oblongata.
It is responsible for many vital functions of life, such as breathing, consciousness, blood pressure, heart rate, and sleep.
It contains many critical collections of white and grey matter.
The grey matter within the brainstem consists of nerve cell bodies and form many important brainstem nuclei. Ten of the twelve cranial nerves arise from their cranial nerve nuclei in the brainstem.
The white matter tracts of the brainstem include axons of nerves traversing their course to different structures. These tracts travel both to the brain (afferent) and from the brain (efferent) such as the somatosensory pathways and the corticospinal tracts, respectively.
Mid Brain
The midbrain is continuous with the cerebral hemisphere.
The upper posterior (i.e. rear) portion of the midbrain is called the tectum, which means "roof."
The surface of the tectum is covered with four bumps representing two paired structures: the superior and inferior colliculi.
The superior colliculi are involved in eye movements and visual processing, while the inferior colliculi are involved in auditory processing.
Another important nucleus, the substantia nigra, is located here.
The substantia nigra is rich in dopamine neurons and is considered part of the basal ganglia.
Pons
An important pathway for tracts that run from the cerebrum down to the medulla and spinal cord, as well as for tracts that travel up into the brain.
It also forms important connections with the cerebellum via fibre bundles known as the cerebellar peduncles.
Posteriorly, the pons and medulla are separated from the cerebellum by the fourth ventricle.
Home to several nuclei for cranial nerves.
Medulla
The point where the brainstem connects to the spinal cord.
Contains a nucleus called the nucleus of the solitary tract that is crucial for our survival (receives information about blood flow, along with information about levels of oxygen and carbon dioxide in the blood, from the heart and major blood vessels).
When this information suggests a discordance with bodily needs (e.g. blood pressure is too low), there are reflexive actions initiated in the nucleus of the solitary tract to bring things back to within the desired range.
Blood Supply
The brain stem receives its blood supply exclusively from the posterior circulation, including the vertebrae and basilar artery.
The medulla receives its blood supply from the vertebral via medial and lateral perforating arteries.
The pons and midbrain receive their blood from the basilar via the medial and lateral perforating arteries.
Thalamus-Anatomy,Physiology,Applied aspectsRanadhi Das
Thalamus is a very important relay station.
All general and special sensory impulses (except smell) & afferent impulses from RAS are integrated here.
Thalamus however is the center of pain and protopathic sensations.
It has other non sensory functions as well, like motor control, sleep, wakefulness.
It is the largest structure deriving from the embryonic diencephalon, the posterior part of the forebrain situated between the midbrain and the cerebrum.
The thalamus is part of a nuclear complex structured of 4 parts, the hypothalamus, epithalamus, prethalamus (formerly called ventral thalamus) and dorsal thalamus.
Lateral ventricle of Brain. By Dr.N.Mugunthan.M.Smgmcri1234
Lateral ventricle of brain. Lecture by Dr.N.Mugunthan.
Associate Professor,
Mahatma Gandhi Medical College & Research Institute,
Sri Balaji Vidyapeeth, Pondicherry.
The brain stem is a critical part of the human brain that connects the brain to the spinal cord.
It plays a vital role in basic life functions and serves as a bridge between the higher brain centers (such as the cerebral cortex) and the rest of the body.
The brain stem is responsible for essential functions such as breathing, heart rate, blood pressure, and basic reflexes.
AN 1.1 introduction anatomical terminology-Dr.GosaiDr.B.B. Gosai
This is first lecture in anatomy regarding anatomical terminology to familiarize students for Anatomical position, various branches of anatomy, Planes, Terms of relations and terms of movements.
Visit my website for more presentations: https://www.drbbgosai.com/
Sexual differentiation in men and women with special attention to: Gonads, Mullerian structures, Wolffian ducts and urogenital sinus.
Examples of gonadal dysgenesis
Disorders of Sexual differentiation phenotype, chromosomal background, biological background, mechanism of hormonal disruption and endocrinological mechanisms leading to: Swyer syndrome, Androgen insensitivity syndrome and masculinization of female fetus in congenital adrenal hyperplasia. Describe three uterine anomalies resulting from variation in the fusion of Muller’s tubercles.
Describe the anatomical situation in a patient with Mayer-Rokitanski-Kuster
More presentations on https://www.drbbgosai.com/
Anatomy of Breast in clinical perspective-Dr.GosaiDr.B.B. Gosai
Anatomy of breast in clinical perspective including structure, blood supply, lymphatic drainage, spread of carcinoma of breast, development and related anomalies.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
1. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Brain stem
Introduction:
It is part of central nervous system connecting spinal cord with the forebrain.
Location:
Posterior cranial fossa on basilar part of occipital bone.
Parts: (From Above downwards) (****Viva)
Midbrain
Pons
Medulla oblongata
Anterior surface of Brainstem Posterior surface of Brainstem
Midbrain
Pons
Medulla oblongata
Pons
Midbrain
Medulla oblongata
2. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Midbrain:
Upper most part of brain stem.
It connects brainstem to diencephalon and cerebrum.
External Features: (Midbrain) (***viva)
Anterior surface of Brainstem Posterior surface of Brainstem
Features on Anterior surface:
Cerebral peduncles (Crus cerebri): Diverging peduncles are bundle of fibers seen on
anterior surface.
Features on Posterior surface:
Colliculi: (All four colliculi together also known as Corpora Quadrigemina or tectum of
midbrain)
1. Two superior colliculi: (Concerned with Visuospinal reflex)
2. Two inferior colliculi: (Relay station of Auditory pathway)
Cerebral peduncle
Occulomotor nerve Trochlear nerve
Inferior colliculus
Superior colliculus
3. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Nerves emerging from Midbrain: (***Viva)
Occulomotor nerve (III cranial nerve): emerging from medial aspect of cerebral
peduncles on anterior surface supplies all muscles of eyeball except Superior oblique
and Lateral rectus.
Trochlear nerve (IV cranial nerve): emerging from posterior surface of midbrain below
inferior colliculus. (ONLY CRANIAL NERVE EMERGING FROM POSTERIOR SURFACE)
Internal Features: Internal features studied by two sections of midbrain:
1. Transverse Section (T.S.) at level of superior colliculus
2. Transverse Section (T.S.) at level of inferior colliculus
Transverse Section (T.S.) at level of superior colliculus:
4. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Gray matter seen in the section: (Nuclei seen at this level) (***viva)
1. Occulomotor nucleus: in the periaqueductal region supplies all muscles of
eyeball except superior oblique and lateral rectus. It is also contain fibers of
Edinger Westphal nucleus (Parasympathetic nucleus) for light reflex and
accommodation reflex.
2. Red nucleus: red colous nucleus in tegmentum of midbrain concerned with
motor activity.
3. Substantia Nigra: Purple colour nucleus between crus cerebri and tegmentum.
They are dopaminergic neurons and damage to this neurons leads to Parkinson’s
disease.
4. Nucleus of superior colliculs: Center for Visuospinal reflex (Movement of
eyeball, head and neck and trunk while following a moving object for example
looking at the flying objects like plane).
White matter seen in the section: (***viva)
1. Crus cerebri: containing corticopontine fibers from cortex to pontine nuclei and
corticonuclear and corticospinal tracts.
2. Spinal lemniscus: Bundle of fibers containing spinothalamic tracts to thalamus.
3. Trigeminal lemniscus: Bundle of fibers containing sensory fibers from trigeminal
nerve to thalamus.
4. Medial lemniscus: Bundle of fibers containing posterior column fibers from
spinal cord to thalamus.
5. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of inferior colliculus:
Gray matter seen in the section: (Nuclei seen at this level) (***viva)
1. Troclear nucleus: in the periaqueductal region supplies superior oblique muscle
of eye
2. Substantia Nigra: Purple colour nucleus between crus cerebri and tegmentum.
They are dopaminergic neurons and damage to this neurons leads to Parkinson’s
disease.
3. Nucleus of inferior colliculs: Relay station of Auditory pathway of hearing.
White matter seen in the section: (***viva)
1. Crus cerebri: containing corticopontine fibers from cortex to pontine nuclei and
corticonuclear and corticospinal tracts.
2. Superior cerebellar peduncle: Fibers from cerebellum cross in midbrain at this
level.
6. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
3. Spinal lemniscus, Trigeminal lemniscus and Medial lemniscus same as section
at level of superior colliculus).
4. Lateral lemniscus: Bundle of fibers containing auditory pathway to inferior
colliculus for relay.
Applied anatomy of Midbrain: (***viva)
Trauma to midbrain: due to sharpe edge of tentorium cerebelli.
Ipsilateral paralysis of muscles of eye
Dilated pupil and loss of accommodation reflex and light reflex
Blockage of cerebral aqueduct:
It leads to Hydrocephalus.
Weber’s Syndrome:
Occlusion of Posterior cerebral artery
Involve Occulomotor nerve and crus cerebri.
Ipsilateral ophthalmopegia
Contralateral paralysis of lower part of face, tongue, arm and leg
Eyeball deviated laterally (Paralysis of medial rectus)
Drooping of eyelid (ptosis)
Pupil is dilated and fixedto light and accomodation reflex
7. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Benedict’s Syndrome:
Occlusion of Posterior cerebral artery
Similar to Weber’s syndrome with following differences:
Involve Medial lemniscus and Red nucleus
Contralateral hemianesthesia
Involuntary movements of limbs on opposite side.
8. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Pons:
Middle and widest part of brain stem.
It is between medulla oblongata and midbrain.
Anterior surface of Brainstem Posterior surface of Brainstem
External Features: (***viva)
Features on Anterior surface:
Basilar sulcus: Midline sulcus which is occupied by Basilar Artery.
Transverse running fibres on the surface: Pontocerebellar fibres which continues as
Mddle cerebellar peduncle
Trigeminal nerve emerge at lateral part of pons
Basilar Sulcus
Trigeminal nerve
Facial colliculus
9. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Features on Posterior surface: (***viva)
Median sulcus in the midline
Facial colliculus: Paramedian elevation raised by underlying abducent nucleus covered
by winding fibres of facial nerve
Nerves emerging from Pons: (***viva)
Trigeminal nerve (V cranial nerve): emerging from lateral part. It demarcates between
pons and middle cerebellar peduncle.
Internal Features: Internal features studied by two sections of Pons:
It is divided into two parts by transversely running fibers known as Trapezoid body:
Basilar part: Anterior part
Tegmentum: Posterior part
Basilar part is same at both level of sections:
Basilar part contains: Pontocerebellar tract (transversely running) & Corticospinal tract
(Vertically running) and dispersed Pontine nuclei
1. Transverse Section (T.S.) at level of Trigeminal nuclei
2. Transverse Section (T.S.) at level of Facial colliculus
10. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of Trigeminal nuclei:
Gray matter seen in the section: (Nuclei seen at this level) (**viva)
1. Motor nucleus of trigeminal nerve: supply muscles of mastication.
2. Principal sensory nucleus of trigeminal nerve: Lateral to motor nucleus (Touch
and Pressure sensations from Face) (**viva)
White matter seen in the section:
1. Trapezoid body (Fibers derived from cochlear nuclei and run transversely)
2. Medial lemniscus: Continuation of posterior column fibers
3. Spinal lemniscus: Spinothalamic tracts
4. Lateral Lemniscus: Continuation of auditory pathway
11. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of Facial colliculus:
Gray matter seen in the section: (Nuclei seen at this level) (****Viva)
1. Facial nucleus: Supply muscles of facial expression. Facial nerve from facial
nucleus winds around the abducent nucleus.(Neurobiotaxis)
2. Abducent nucleus: supply Lateral rectus muscle of eye.
3. Vestibular and cochlear nuclei
White matter seen in the section:
1. Trapezoid body
2. Medial longitudinal fasciculus
3. Spinal lemniscus, Medial Lemniscus and Lateral Lemniscus: (Same as above
section )
12. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Applied Anatomy of Pons
Tumors of pons:
Occuring in childhood
Weakness of facial muscles, Lateral rectus paralysis (Medial squint of eye) and
contralateral hemiparesis is characteristic of involvement of Pons.
Nystagmus
Impairment of hearing
Weakness of jaw muscles
Pontine hemorrhage: (****viva)
Hemorrhage from basilar artery
“Pinpoint” pupil
Facial paralysis same side
Paralysis of muscles of opposite side
13. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Medulla Oblongata:
Lower part of brain stem
Continues as Spinal cord at foramen magnum
Pyramidal in shape
Anterior surface of Brainstem Posterior surface of Brainstem
External Features: (Medulla Oblongata) (****Very important –Short note and viva)
Features on Anterior surface: (***viva)
Anterior Median fissure-same like spinal cord
Pyramidal dicussation-crossing over of corticospinal tract
Pyramid-an paramedian elevation raised by corticospinal tract
Olive- An oval shaped elevation lateral to pyramid
Inferior Cerebellar peduncle: Bundle of fibres lateral to olive
Pyramid
VII
Vagal triangle
Hypoglossal triangle
VI
Olive Gracile and cuneate
tubercles
SCP
ICP
MCP
VIII
X
IX
XI
XII
Pyramidal decussation
14. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Features on Posterior surface: (***viva)
Closed Part: lower part with posterior median sulcus, tractus gracilis & cuneatus,
Gracile & cuneate tubercles
Open part: Vagal triangle & Hypoglossal triangle
Nerves emerging from Medulla oblongata: (***viva)
Abducent nerve (VI cranial nerve): at ponto-medullary junction near pyramid
Facial nerve (VII Cranial nerve) & Vestibulocochlear nerve (VIII Cranial nerve): at
pontomedullary junction laterally
Glossopharyngeal (IX cranial nerve) , Vagus (X cranial nerve)and cranial part of
Accessory nerve (XI cranial nerve): Behind the olive
Hypoglossal nerve XII Cranial nerve): Between the pyramid & olive
Internal Features: Internal features studied by three sections of Pons:
1. Transverse Section (T.S.) at level of Pyramidal decussation
2. Transverse Section (T.S.) at level of Sensory decussation
3. Transverse Section (T.S.) at the level of Open part of Medulla oblongata
15. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of Pyramidal decussation:
Gray matter seen in the section:
1. Supraspinal nucleus continuation of Substantia gelatinosa (Nucleus for 1st
cervical nerve)
2. Spinal Accessory Nucleus (Supply Sternocleidomastoid and trapezius)
White matter seen in the section:
1. Pyramidal Tracts
2. Pyamidal deccussation where 75 % fibres of Pyramidal tract (Corticospinal
teract) crosses to opposite side (Motor tract) and form lateral corticospinal
tract. (***viva)
3. Other ascending tracts
16. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of Sensory decussation:
Gray matter seen in the section: (Nuclei at this level) (**viva)
1. Nucleus Gracilis & Cuneatus (Relay station for tectile descriminations, vibration
and conscious joint sensation)
2. Nucleus of Spinal Tract of trigeminal nerve (Pain and temperature from face)
White matter seen in the section:
1. Pyramidal Tracts
2. Sensory deccussation where fibres of Gracile & Cuneate tract crosses to
opposite side by internal arcuate fibres and forms Medial Lemniscus (Posterior
column fibers) (***viva)
3. Lateral and Anterior spinothalamic tract combine to form Spinal Lemniscus
4. Other ascending tracts
17. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Transverse Section (T.S.) at level of Open part of Medulla oblongata (At the level of Olive):
(****Very important Section)
Gray matter seen in the section: (Nuclei seen at this level) (***viva)
1. Hypoglossal Nucleus (Supply muscles of tongue)
2. Dorsal Vagal Nucleus (Parasympathetic to heart, lung and abdomen)
3. Vestibular nuclei(Balance) & Cochlear Nuclei (Hearing)
4. Inferior Olivary Nucleus (extrapyramidal motor)
5. Nucleus Ambiguus (Combine nucleus of 9th
,10th
and Cranial accessory nerve-
Pharynx, soft palate Larynx)
6. Nucleus of tractus solitarius (Taste sensation)
7. Nucleus of Spinal Tract of trigeminal nerve
18. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
8. Arcuate nuclei: Displaced pontine nuclei
White matter seen in the section:
1. Pyramidal Tracts
2. Medial Lemniscus
3. Tectospinal tract
4. Medial Longitudinal Fasciculus (Paramedian bundle- coordinate activities of
different nuclei)
5. Inferior cerebellar peduncle
6. Spinal lemniscus
7. Other ascending tracts
Applied Anatomy (Medulla oblongata):
Medulla oblongata contain dorsal vagal nucleus which is cardiorespiratory centre and
damage to this leads to Death. Hence it is also known as vital center.
Arnold-Chiari Malformation is congenital anomaly.
1. Herniation of tonsil of cerebellum and Medulla oblongata through Foramen
magnum.
2. Blockage of roof of fourth ventricle.
3. Internal Hydrocephalus.
4. Associated other anomalies like spina bifida.
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Lateral Medullary Syndrome: (PICA Syndrome) (**viva)
Blockage of Posterior Inferior Cerebellar Artery
Damage to lateral part of Medulla
Paralysis of palatal and laryngeal muscle
Loss of balance
Vertigo, nausea, vomiting, Nystagmus
Dysphagia-difficulty in swallowing
Dysarthria-difficulty in speech
Loss of pain (Analgesia) and temperature sensations on face
Ipsilateral Horner’s syndrome
20. Ojvensha E learning Resources-Prepared by Dr.B.B.Gosai
Medial Medullary Syndrome:
Blockage of Vertebral artery
Damage to Medial part
Contralateral hemiplegia
Ipsilateral Paralysis of muscles of tongue-tip pf tungue deviates to the
paralysed side.
Contralateral loss of vibration, joint position and tectile discrimination
sensations
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