Auditory Nerve

Question 1

What are the 2 branches of the auditory nerve?

Answer 1

Vestibular branch (superior and inferior) and cochlear branch (cochlea)

Question 2

What shape is the auditory nerve and how many neurons is the auditory branch made of?

Answer 2

a cable shape and 30,000

Question 3

How long is the auditory nerve?

Answer 3

an inch

Question 4

T/F: The auditory nerve is considered to be afferent special sense

Answer 4

False; there are primarily afferent fibers but there are also some efferent

Question 5

Where do the efferent fibers of auditory nerve start?

Answer 5

heschels gyrus (primary auditory cortex; brodmanns are 41 and 42)

Question 6

Where do the efferent fibers of the auditory nerve end?

Answer 6

in the cochlea at the base of the hair cells

Question 7

All afferent “primary” fibers means

Answer 7

they all carry actions potentials w/ the typcal depolarization/ hyperpolarization sequence at one phase in the sine wave

Question 8

The neurotransmitters are PROBABLY _____________ and _____________

Answer 8

glutamate and aspartate

Question 9

____% of of the fibers of the auditory nerve start at the base of the inner hair cells

Answer 9

95

Question 10

____% of the fibers of the auditory nerve start at the base of the outer hair cells

Answer 10

5

Question 11

From the base of the hair cells, the dendrite course through small holes called ___________ ____________ in the osseous spiral lamina

Answer 11

habenula perforata

Question 12

Dendrites travel towards the modiolus
to the cell bodies (spiral ganglion) in
an enlarged area of bone called
_____________ __________

Answer 12

Rosenthal’s Canal

Question 13

The axons from the cell bodies make up the ______________ cranial nerve

Answer 13

auditory