unit 3: CN VIII, vestibulocochlear

Question 1

purely sensory CN, composed of the vestibular and cochlear nerves

Answer 1

vestibulocochlear nerve

Question 2

nucleus of termination for the VESTIBULAR nerve, and its four parts

Answer 2

• vestibular complex

- superior, medial (most synapse here), lateral, inferior

Question 3

the nuclei of termination (2) for the COCHLEAR nerve

Answer 3

anterior cochlear nuclei

posterior cochlear nuclei

Question 4

vestibular nerve fibers arise from CB located in the _____ ____, which has inferior and superior parts

Answer 4

vestibular ganglion

Question 5

cochlear nerve is made up of bipolar neruons whose CB are in the ___ ___ of the cochlea, where peripheral processes are received from the ___ ___

Answer 5

spiral ganglion
spiral organ (of corti)

Question 6

location of the 2 cochlear nuclei (of termination), lateral to the vestibular nuclei

Answer 6

posterior superior MO

Question 7

from the cochlear nuclei, axons CROSS TO THE OTHER SIDE of the brainstem and synapse in the ____ ___, where axons form the _____ ____

Answer 7

trapezoid nuclei

lateral lemniscus

Question 8

• PERIPHERAL processes from the vestibular ganglion extend to 3 inner ear structures ___ ___ & 3 ____ ___
• CENTRAL processes convey info to the vestibular nuclei, located in the ______ on the floor of the rhomboid fossa

Answer 8

saccule
utricle
semicircular ducts
MO

Question 9

most vestibular nerve fibers terminate in the _____ vestibular nucleus and some fibers travel directly to the cerebellum via the ___ __ ___

Answer 9

medial

inferior cerebellar peduncle

Question 10

information in the vestibulocochlear nerve travels from ____ to _____

Answer 10

distal

proximal

Question 11

apparent origin of the vestibulocochlear nerve

Answer 11

cerebellopontine angle

Question 12

vestibulocochlear nerve travels in the posterior cranial fossa to enter the ___ ___ ____ (along w/ the facial nerve, which runs inferiorly to it)
-course follows within the temporal bone

Answer 12

internal acoustic meatus

Question 13

the COCHLEAR nerve carries ____ fibers and has no branches, while the VESTIBULAR carries about _____ fibers and splits into a superior and inferior branch

Answer 13

30-40,000

20,000

Question 14

the inferior vestibular branch has about ___ fibers while the superior branch carries about ____

Answer 14

8000

12000

Question 15

the inferior vestibular branch is composed of the ____ nerve, which supplies the saccule & the ___ ___ nerve, which supplies the posterior ampullary crest

Answer 15

saccular

posterior ampullary

Question 16

the superior vestibular branch is formed by the ___ & ___ ___ nerves, which supply the lateral & anterior ___ ____

Answer 16

lateral & anterior ampullary

semicircular canals

Question 17

the UTRICLE is supplied by a branch of the __ __ nerve as well as a branch directly off of the ___ ___ branch, which also sends a branch of its own to the SACCULE (voit’s nerve)

Answer 17

lateral ampullary

superior vestibular

Question 18

Name for the branch that goes directly to saccule from superior branch (of vestibular n)

Answer 18

voit’s nerve

Question 19

Schwalbe is term for ___ ___ nucleus

Answer 19

medial vestibular