Ear: Vestibulocochlear Nerve

Question 1

Vestibulocochlear nerve

Answer 1

1. 8th cranial nerve
2. 2 combined nerves (cochlear and vestibular) which enters brain stem in ponto-cerebellar angle
3. It divides at internal auditory meatus into large anterior part (cochlear nerve) and small posterior part (vestibular nerve)

Question 2

Vestibular nerve

Answer 2

Formed by:
Central processes of bipolar cells of vestibular ganglion:
lies in internal auditory meatus bottom
2. Peripheral processes:
pass to vestibular end organs in utricle, saccule, and semicircular ducts

Question 3

Vestibular nerve relay

Answer 3

Enters brain stem to relay in vestibular nuclei responsible for equilibrium

Question 4

Cochlear nerve

Answer 4

Formed by:
1. Central processes of bipolar cells of spiral ganglion:
lies in spiral canal of cochlea
2. Peripheral processes:
pass to hair cells of organ of corti

Question 5

Cochlear nerve relay

Answer 5

Enters brain stem to relay in ventral and dorsal cochlear nuclei responsible for hearing sense