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Surface anat of BS

What is the obex? point where the central canal opens into the 4th ventricle
What is the Roof of the 4th ventricle Anterior (superior) and posterior (inferior) medullary velum Choroid plexus Cerebellum
What does the choroid plexus produce makes CSF
The velum do? keeps spinal fluid contained
Where are the pyramids found? On the ventral (anterior) surface of the brainstem (medulla) on either side of the ventral median fissure
What is found in the pyramids? CST-- CBT- part of CST that supplies some cranial nuclei
What is in between the two pyramids? Ventral median fissure
how are the pyramids organized? Somatotopically
What cranial nerve exists via the ventrolateral sulcus CN XII--Hypoglossal rootlets (all motor, tongue mvements
What cranial n. exits Dorsolateral sulcus cranial part of XI (accessory), CN X (Vagus), CN IX (glossopharnygeal)
What is the prominent oval swelling of the lateral area of the medulla b/t the ventrolateral and dorsolateral sulci? the Olive
Dorsal surface of medulla contains what? Fasciculus gracilis fascisculus cuneatus clava cuneate tubercle vagal trigone hypoglossal trigone 3 foramina
Fasciculus gracilis and cuneatus are part of what? Dorsal column-- in medulla means tract and somatotopic organization
What is the other name for the gacile tubercle? and what is contained at this site? Clava; nucleus gracilis (medial)
What is contained in the cuneate tubercle? the nucleus cuneatus (lateral)
What is contained in the vagal trigone? where is it located? dorsal motor nucleus of the vagus; small swelling in the floor of the ventricle (lateral ridges)
what is contained in the hypoglossal trigone? Where is it located? Hypoglossal nucleus; small swelling on the flor of the ventricle (medial ridges)
What are the three foramina on the dorsal surface of the medulla? What is their purpose? Foramina Luschka and Foramina Magendie. openings in the fourth ventricle allowing CSF to flow from the 4th ventricle into the subarachnoid space
Which is more medial: luschka or magendie? magendie (one foramina--opening at the obex)
Which is more lateral: luschka or magendie? luschka (2 foramina)
What is located on the anterior (ventral aspect) of the pons The bridge, basal sulcus, 3 nerves from the groove b/t the pons and medulla
What is the bridge that is located on the pons? Also called "pons proper"--a thick band of transverse fibers-- going across to the middle cerebellar peduncles
What is the baslar sulcus on the anterior surface of pons? furrow on the bridge that extends along the midline and coincides with the course of the basilar artery
What nerves emerge from the groove b/t the pons and medulla? Abducens Facial and Vestibulochochlear
Looking at the lateral surface of the pons what is seen? middle cerebellar peduncles cerebellopontine angle facial nerve vestibulocochlear n trigeminal n.
Looking at dorsal aspect of the pons, what can be seen? Pontine part of the floor of 4th ventricle, walls of the 4th ventricle, roof of the ventricle
what does the cerebellopontine angle consist of? the triangular space formed b/t the caudal boarder of the middle cerebellar peduncle, the adjoining part of the cerebellum and the upper part of the medulla
What emerges from the cerebellopontine angle? Facial nerve and vestibulocochlear nerve
What is another name for the middle cerebellar peduncles? Brachia pontis
The facial colliculus lies where? rostral to the lateral recess in the floor of the ventricle
What forms the facial colliculus? The abducens nucleus and the fibers of facial nerve that cross over the nucleus of the abducens
what is another name for the superior cerebellar peduncles? brachia conjunctiva
What forms the wall of the 4th ventricle at the level of the pons superior cerebellar peduncles (brachia conjunctiva)
In the pons, what joins the sup. cerebellar peduncles in midline and complete the roof of the ventricle the cerebellar vermis in the caudal pons and the anterior medullary velum rotrally
midbrain is where? consists of a short segment of brain stem b/t the pons and diencephalon
The midbrain comprised of what? two lateral halves called the cerebral peduncles
Each of the halves (of cerebral peduncles) are divided into what? an anterior part, crus cerebri and posterior part, the tegmentum
Cerebral peduncles are what? bands coming from motor cortex (somatatopic organization)--carry CST and CBT to the spinal cord
The anterior aspect of the midbrain shows what? cerebral peduncles, interpeduncular fossa CN III--occulomotor
What exits from the sides of the interpenduncular fossa and emerge on the surface at the transverse groove between the pons and midbrain? The oculomotor nerves
dorsal aspect of midbrain is comprised of what? Corpora quadrigemina Trochlear n.
What does the corpora quadrigemina consist of? The rostral pair are called superior colliculi, and the somwhat smaller caudal pair are the inferior colliculi
Where does the trochlear nerves emerge? From the posterior surface just behind inferior colliculi after decussating in the anterior medullary velum
Floor of the 4th ventricle 1. caudal part formed by dorsal surface of the medulla 2. rostral part formed by the pons 3
Roof of the fourth ventrical anterior and posterior medullary vellum and cerebellum
Lateral boundaries of the 4th ventricle 1. Brachium conjunctiva (sup. cerebellar peduncle 2. Restiform body (inferior cerebellar peduncle) 3. Clava (gracile tubercle) and cuneate tubercles
Spinal cord to brain stem tracts? Corticospinal tracts, dorsal columns, spinothalamic tracts
Created by: Amusch21



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