Brainstem

Question 1

whats the inferior brachium?

Answer 1

fibers connecting the medial geniculate body to the inferior colliculus

Question 2

whats the superior brachium?

Answer 2

main fibers going from cerebral cortex and retina to superior
colliculus

Question 3

whats the medial longitudinal fasciculus do?

Answer 3

connects cochlear and vestibular nuclei with nuclei connecting extraocular muscles (III, IV, VI)

Question 4

where is the oculomotor nucleus located?

Answer 4

in the grey matter posterior to medial longitudinal fasciculus at the level of the superior colliculus

Question 5

which cranial nerves come from the midbrain?

Answer 5

oculomotor nucleus and trochlear nucleus
note: mesencephalic nucleus of trigeminal nerve

Question 6

at which level of the brainstem is the cerebral aqueduct seen?

Answer 6

midbrain

Question 7

decussation of the superior cerebellar peduncles occur at the level of the inferior colliculus. T or F.

Answer 7

T

Question 8

which nuclei of cranial nerves present in the pons at the level of the trigeminal nuceli?

Answer 8

• motor and sensory nuclei of the trigeminal nerve

Question 9

what is the trapezoid body in the pons?

Answer 9

fibers derived from cochlear nuclei and they run transversely in the anterior part of the tegmentum

Question 10

what are the pontine nuclei?

Answer 10

• small masses of nerve cells whose axons give transverse fibers which intersect corticospinal and corticonuclear tracts, breaking them into small bundles
• these transverse fibers enter the middle cerebellar peduncles to go to the cerebellar hemisphere (main pathway connecting cerebellum to cerebral cortex)

Question 11

which fibers terminate in the pontine nuclei?

Answer 11

corticopontine fibers of crus cerebri terminate in pontine nuclei

Question 12

which tract joins the superior cerebellar peduncles?

Answer 12

anterior spinocerebellar tract

Question 13

which nuclei of the cranial nerves are present in the pons at the level of the facial colliculus?

Answer 13

• spinal nucleus of trigeminal nerve
• abducent nucleus
• facial nucleus (motor)
• medial vestibular nucleus
• posterior and anterior cochlear nuclei

Question 14

midbrain ascends through which opening?

Answer 14

opening of tentorium cerebelli (tentorium notch)

Question 15

whats the striae medullaris?

Answer 15

portion of the cochlear division of the vestibulocochlear nerve