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PNS > exam 2 vestibulocochlear > Flashcards

exam 2 vestibulocochlear Flashcards

1
Q

what type of signal is transmitted by the vestibulocochlear nerve?

A

it is purely a sensory nerve

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2
Q

what is the vestibulocochlear nerve composed of?

A

two nerves
the vestibular nerve
the cochlear nerve

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3
Q

where does the vestibular nerve terminate?

A 
vestibular nuclear complex
-consists of four parts
superior
inferior
medial 
lateral
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4
Q

what does the vestibular nuclear complex consist of?

A 
it consists of four parts
superior
inferior
lateral
medial
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5
Q

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

A

vestibular ganglion

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6
Q

the vestibular ganglion consists of what parts and is located where?

A

inferior and superior parts and is located in the internal acoustic meatus

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7
Q

what do the fibers of the vestibular nerve arise from?

A

cell bodies in the vestibular ganglion

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8
Q

where does the cochlear nerve terminate?

A

two cochlear nuclei
anterior cochlear nuclei
posterior cochlear nuclei

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9
Q

what is the cochlear nerve composed of?

A

axons from the spiral ganglion

-located in the cochlear

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10
Q

the cochlear nerve is made up of what type of neurons, and where are their cell bodies located?

A

it is made up of BIPOLAR neurons with cell bodies located in the spiral ganglion of the cochlea

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11
Q

peripheral processes of the cochlear nerve extend from where to where?

A

the peripheral processes extend from the spiral ganglion to the spiral organ (organ of corti)

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12
Q

axons from the cell bodies of the spiral ganglion are carried in the cochlear nerve to terminate on what nuclei? located where?

A

the anterior and posterior cochlear (two nuclei)

located in the posterior, superior medulla oblongata lateral to the vestibular nuclei

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13
Q

continuing with the auditory pathway, axons extend from the cochlear nuclei and do what?

A

they cross to the other side of the brainstem and synapse in the trapezoid nuclei

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14
Q

continuing with the auditory pathway, axons extend from the trapezoid nuclei and do what?

A

form the lateral lemniscus

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15
Q

peripheral processes from the vestibular ganglion extend to what?

A

the peripheral processes extend to three inner ear structures.
the saccule
the utricle
the semicircular canals

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16
Q

central process from the vestibular ganglion conveys information to what nuclei? located where?

A

the vestibular nuclei

located in the medulla oblongata on the floor of the rhomboid fossa

17
Q

most vestibular nerve fibers will terminate where?

A

the medial vestibular nucleus (schwalbe)

18
Q

while most vestibular nerve fibers will terminate in the medial vestibular nucleus (schwalbe), some fibers will travel where?

A

they will travel directly to the cerebellum by way of the inferior cerebellar peduncle

19
Q

what is the apparent origin of the vestibular nerve?

A

cerebellopontine angle

20
Q

the vestibular nerve travels through which cranial fossa on its way to the internal acoustic meatus?

A

the posterior cranial fossa

21
Q

what enters the the internal acoustic meatus with the vestibular nerve?

A

the facial nerve

22
Q

how many fibers does the cochlear nerve carry with in the temporal bone?

A

30-40,000 fibers

god damn…

23
Q

within the temporal bone the cochlear nerve transverses the internal acoustic meatus inferior to what?

A

inferior to the facial nerve

24
Q

after the cochlear nerve exits the temporal bone, what does it reach?

A

the spiral gangion of the cochlea

25
Q

after exiting the temporal bone how many fibers does the vestibular nerve carry?

A

20,000

26
Q

as the vestibular nerve approaches the ear, what does it do?

A

divides into superior and inferior branches

27
Q

what is the fiber distribution for the inferior and superior branches of the vestibular nerve as it approaches the ear?

A

superior is 12,000 LARGER

inferior is 8,000 smaller

28
Q

the inferior branch of the vestibular nerve is composed of what nerves?

A

saccular nerve
posterior ampullary nerve
which surprisingly supply the saccule and posterior ampullary crest

29
Q

the superior branch of the vestibular nerve is composed of what nerves?

A

lateral and anterior ampullary nerve

which supplies the lateral and anterior semicircular canals

30
Q

what supplies the anterior and lateral semicircular canals?

A

the lateral and anterior ampullary nerves of the superior branch of the vestibular nerve

31
Q

how is the utricle innervated?

A

supplied by a branch of the lateral ampullary nerve, and a branch directly off of the superior branch of vestibular nerve

32
Q

how is the saccule innervated?

A

a branch directly from the superior branch of vestibular nerve. (Voit’s nerve)

33
Q

what are the clinical considerations related to cranial nerve 8?

A

acoustic neuroma
tinnitus
cochlear implants
vestibular disease

PNS (6 decks)

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