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GM PNS > Exam 2 CN VIII > Flashcards

Exam 2 CN VIII Flashcards

1
Q

Is the vestibulocochlear nerve sensory or motor?

A

It is purely sensory

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2
Q

T/F the vestibulocochlear nerve is made up of two nerves the vestibular nerve and the cochlear nerve

A

True

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3
Q

Where does the vestibular nerve terminate (non-specific)

A

In the vestibular nuclear complex

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4
Q

What parts make up the vestibular nuclear complex

A

Superior, medial, lateral, and inferior

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5
Q

Fibers carried in the vestibular nerve arise from cell bodies located where?

A

In the vestibular ganglion

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6
Q

What two parts make up the vestibular ganglion

A

Inferior and superior parts

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7
Q

Where does the cochlear nerve terminate

A

Terminates in two nuclei; anterior and posterior

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8
Q

What is the cochlear nerve composed of primarily

A

Composed of axons from spiral ganglion

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9
Q

What is the cochlear nerve made up of

A

Bipolar neurons

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10
Q

Where are the cell bodies located for the bipolar neurons of the cochlear nerve

A

Located in the spiral ganglion

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11
Q

What extends from the spiral ganglion to the spiral organ?

A

Peripheral processes (dendrites)

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12
Q

What is another name for the spiral organ

A

Organ of Corti

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13
Q

Axons from the cell bodies of the cochlear nerve are carried to where

A

They are carried to two cochlear nuclei, located in the posterior, superior M.O. , lateral to vestibular nuclei where they terminate

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14
Q

From the cochlear nuclei, axons cross to where and then synapse where?

A

The other side of the brainstem and synapse in the trapezoid nuclei

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15
Q

After axons from the cochlear nerve synapse in the trapezoid nuclei what do they then form

A

The axons form the lateral lemniscus

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16
Q

What 3 inner ear structures do the peripheral processes of the vestibular ganglion extend to

A

The saccule, utricle, and semicircular canals

17
Q

What convey information to the vestibular nuclei and where are they from?

A

Central processes from the vestibular ganglion

18
Q

Where is the vestibular nuclei located?

A

In the MO on the floor of the rhomboid fossa

19
Q

Where do most vestibular nerve fibers terminate (specific)

A

In the medial vestibular nucleus or Schwalbe

20
Q

Some vestibular fibers travel directly to the cerebellum by way of what

A

The inferior cerebellar peduncle

21
Q

What way does information of the vestibulocochlear travel

A

Distal to proximal

22
Q

What is the apparent origin of the vestibulocochlear nerve

A

The cerebellopontine angle

23
Q

Where does the vestibulocochlear nerve travel within on its way to the internal acoustic meatus

A

Posterior cranial fossa where it enters along with the facial nerve

24
Q

How many fibers does the cochlear nerve carry within the temporal bone

A

30-40,000

25
Q

How many fibers does the vestibular nerve carry in the temporal bone

A

About 20,000

26
Q

As the vestibular nerve travels within the temporal bone what happens as it approaches the ear

A

It divides into superior and inferior branches

27
Q

How many fibers makeup the smaller inferior branch of the vestibular nerve

A

About 8,000

28
Q

What nerves make up the smaller inferior branch of the vestibular nerve

A

The saccular nerve and the posterior ampullary nerve

29
Q

What do the saccule and posterior ampullary nerve supply

A

The saccule and posterior ampullary nerve crest

30
Q

How many fibers make up the larger superior branch of the vestibular nerve

A

About 12,000 fibers

31
Q

What forms the larger superior branch of the vestibular nerve after it splits and what do they supply

A

Lateral and ampullar nerves which supply the lateral and anterior semicircular ducts

32
Q

How is the utricle supplied

A

By a branch from the lateral ampullary nerve and a branch directly off the superior branch

33
Q

Where does the superior branch of the vestibular nerve send a branch directly to and what is the name of that nerve

A

The saccule, named Voit’s nerve

34
Q

What two branches make up the inferior branch of the vestibular nerve after it splits

A

The saccular nerve and the posterior ampullary nerve

35
Q

What is an acoustic neuroma

A

Vestibular Schwannoma

36
Q

What is tinnitus

A

Ringing in the ears

37
Q

Tinnitus is the first sign of what disease and what are the other symptoms

A

Mire’s disease which is vertigo, tinnitus, and hearing loss

38
Q

What is vestibular disease

A

You experience a lot of vertigo

39
Q

How do you tell the difference between vestibular disease vertigo and cervicogenic vertigo?

A

Do the spinning in the chair test. If it reproduces vertigo then it is a good indication it is cervicogenic vertigo

GM PNS (12 decks)

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