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PNS > CN VIII > Flashcards

CN VIII Flashcards

1
Q

What is the name given to CN VIII?

A

Vestibulocochlear nerve

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2
Q

What kind of information is carried by CN VII?

A

special sensory only

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3
Q

How many nerves make up CN VIII and what are they?

A

2; vestibular and cochlear

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4
Q

Where does the vestibular nerve terminate?

A

vestibular nuclear complex

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5
Q

What are the 4 parts of the vestibular nuclear complex?

A

superior (bechterew), medial (schwalbe), lateral (deiter), and inferior

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6
Q

Which part of the vestibular nuclear complex gives rise to most of the fibers of the vestibulospinal tract?

A

lateral (deiter)

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7
Q

Where do fibers in the vestibular nerve originate?

A

cell bodies in the vestibular ganglion

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8
Q

Where is the vestibular ganglion?

A

internal acoustic meatus

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9
Q

T/F: the vestibular ganglion has 2 parts, inferior and superior.

A

true

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10
Q

Where does the cochlear nerve terminate?

A

in the two cochlear nuclei (anterior and posterior)

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11
Q

Where do the axons composing the cochlear nerve originate?

A

spinal ganglion

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12
Q

What kind of neurons make up the cochlear nerve?

A

bipolar neurons

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13
Q

Where are the cell bodies of the neurons that make up the cochlear nerve?

A

in the spiral ganglion of the cochlea

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14
Q

What is the route of peripheral processes of the cochlear nerve?

A

from spiral ganglion to spiral organ

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15
Q

What is the other name for the spiral organ?

A

organ of Corti

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16
Q

Where are the nuclei of termination for the cochlear nerve (cochlear nuclei) located?

A

in the posterior, superior MO, lateral to the vestibular nuclei

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17
Q

From the cochlear nuclei, axons cross to the other side of the brainstem and synapse in what nuclei?

A

trapezoid nuclei

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18
Q

What do axons from the trapezoid nucleus form?

A

lateral lemniscus

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19
Q

Where do fibers from the lateral lemniscus travel?

A

to medial geniculate body of thalamus (with a few fibers dropping off in the inferior colliculus)

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20
Q

What 3 inner ear structures are innervated by peripheral processes from the vestibular ganglion?

A

saccule, utricle, and semicircular canals

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21
Q

Where are the vestibular nuclei?

A

in the MO on the floor of the rhomboid fossa

22
Q

Where do central processes from the vestibular ganglion convey info to?

A

vestibular nuclei

23
Q

Where do most vestibular nerve fibers terminate?

A

in the medial vestibular nucleus (Schwalbe)

24
Q

How do some fibers of the vestibular nerve travel directly to the cerebellum?

A

by way of the inferior cerebellar peduncle

25
Q

Which direction does info in CN VIII travel?

A

from distal to proximal

26
Q

Where is the apparent origin of CN VIII?

A

cerebellopontine angle

27
Q

T/F: CN VIII has no branches to structures outside of the ear.

A

True

28
Q

From its apparent origin, what fossa does CN VIII travel in to get to the internal acoustic meatus?

A

posterior cranial fossa

29
Q

What other cranial nerve enters the internal acoustic meatus along with CN VIII

A

Facial (VII)

30
Q

T/F: The cochlear nerve carries about 60,000 fibers.

A

False; 30-40k

31
Q

After traversing the internal acoustic meatus inferior to the facial nerve, the cochlear nerve leaves the temporal bone to reach what structure?

A

spiral ganglion of the cochlea

32
Q

How many fibers are carried by the vestibular nerve?

A

about 20k

33
Q

Which branch of the vestibular nerve is bigger, the superior or the inferior branch?

A

superior branch is bigger

34
Q

What does the inferior branch of the vestibular nerve supply?

A

saccule and posterior ampullary crest

35
Q

what two nerves compose the inferior branch of the vestibular nerve?

A

saccular nerve and the posterior ampullary nerve

36
Q

What is supplied by the superior branch of the vestibular nerve?

A

lateral and anterior semicircular canals

37
Q

What two nerves form the superior branch of the vestibular nerve?

A

lateral and anterior ampullary nerves

38
Q

What branch(es) supply the utricle?

A

a branch from the lateral ampullary nerve and a branch directly off the superior branch of the vestibular nerve

39
Q

In addition to the semicircular canals and the utricle, what else is supplied by the superior branch of the vestibular nerve?

A

saccule

40
Q

What is the name of the branch from the superior branch of the vestibular nerve which innervates the saccule?

A

Voit’s nerve

41
Q

T/F: all of the nerve fibers that innervate the utricle ultimately come from the superior branch of the vestibular nerve.

A

True

42
Q

What ganglion does the cochlear nerve travel to?

A

spiral ganglion

43
Q

What ganglion does the vestibular nerve travel to?

A

vestibular ganglion

44
Q

What clinical consideration of CN VIII can cause hearing problems and perhaps get large enough to increase pressure on the brain stem/cranium?

A

Acoustic neuroma

45
Q

What is the other name for an acoustic neuroma?

A

vestibular schwanoma

46
Q

What is tinnitus?

A

ringing in the ears

47
Q

What disease mentioned in class can tinnitus be the 1st sign of?

A

Manier’s Disease

48
Q

Other than ringing in the ears, what other symptoms are associated with tinnitis?

A

hearing deficits and vertigo

49
Q

Are cochlear implants more or less common modernly?

A

more common

50
Q

Patients with severe hearing loss, specifically sensorineural hearing loss with a functioning cochlear nerve, are candidates for what?

A

cochlear implants

51
Q

Sit a patient in a swivel chair, hold the head stationary, and swivel the chair to identify a cervical spine issue (if this causes vertigo). What is this a test for?

A

vestibular disease

52
Q

T/F: vestibular disease has a differential diagnosis from cervicogenic vertigo.

A

true

PNS (43 decks)

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