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PNS final > inner ear > Flashcards

inner ear Flashcards

1
Q

what are the 2 parts of the inner ear labyrinth?

A

bony and membranous

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2
Q

the _____ labyrinth is an enclosure for the ____ labyrinth

A

bony; membranous

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3
Q

what is the membranous labyrinth surrounded by?

A

perilymph

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4
Q

what are the 3 parts of the bony labyrinth?

A

cochlea
vestibule
semicircular canals/ducts

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5
Q

what contains the cochlear duct?

A

cochlea- shaped like a snail

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6
Q

what contains the utricle and saccule?

A

vestibule

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7
Q

what contain the semicircular ducts?

A

lateral, anterior and posterior semicircular canals

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8
Q

the endolymph within the membranous lymph includes what 2 structures?

A

cochlear labyrinth

vestibular labyrinth

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9
Q

what connects the saccule with the cochlea?

A

ductus reuniens

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10
Q

what is the central bony structure that the cochlea wraps around?

A

modiolus

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11
Q

what is the cochlear cupula?

A

apex of the cochlea- directed anterolaterally

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12
Q

what is the bony ridge that connects the cochlea to the modiolus?

A

lamina of the modiolus

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13
Q

what are the 3 channels of the cochlea?

A

cochlear duct
scala vestibuli
scala tympani

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14
Q

what is the channel that the scala vestibuli and scala tympani communicate called?

A

helicotrema

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15
Q

as the stapes vibrates, where are vibrations transmitted?

A

scala vestibuli

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16
Q

what forms the base of the scala vestibuli?

A

oval window

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17
Q

what is the base of the scala tympani?

A

round window

18
Q

vibrations transmitted through the scala vestibuli pass where?

A

scala tympani via the helicotrema

19
Q

the cochlear duct is in the middle of what? what is above it and below it?

A

it is in the middle of the bony labyrinth with the scala vestibuli above and scala tympani below

20
Q

what is the cochlea filled with?

A

endolymph

21
Q

the vestibular membrane separates the cochlea from the?

A

scala vestibuli

22
Q

the basilar or spiral membrane separates the cochlea from the?

A

scala tympani

23
Q

hair cells in the spiral organ are covered by?

A

tectorial membrane

24
Q

what are the hair-like projections from the basilar/spiral membrane sensitive to?

A

frequency and amplitude

25
Q

what are the 2 sacs of the vestibular labyrinth?

A

saccule and utricle

26
Q

what are the 3 semicircular ducts of the vestibular labyrinth?

A

anterior, lateral, posterior

27
Q

what does the saccule communicate with?

A

cochlear duct

28
Q

the utricle is larger and communicates with?

A

all 3 semicircular ducts

saccule by way of utricosaccular duct

29
Q

the sense organs within the saccule and utricle are hairlike projections called?

A

maculae

30
Q

___ are bathed in endolymph. ______ float on endolymph

A

maculae; otoliths

31
Q

movement of the head causes what which elicits impulses?

A

otoliths to deflect the maculae

32
Q

what detects centrifugal and vertical accelerations?

A

utricle

33
Q

what detects linear accelerations?

A

saccule

34
Q

what are the sense organs within the semicircular ducts called?

A

crista

35
Q

where are the crista located?

A

ampulla of each duct

36
Q

the semicircular ducts are particularly sensitive to what type of accelerations?

A

rotational

37
Q

dendrites carrying info to the vestibular ganglion are collected into what 2 branches?

A

superior branch- larger (12,000 fibers)

inferior branch- (8,000 fibers)

38
Q

axons from the vestibular ganglion make up what nerve?

A

vestibular nerve

39
Q

what is the blood supply to the labyrinth?

A

Basilar artery- internal auditory branch

Posterior auricular artery- stylomastoid branch

40
Q

axons from the spiral ganglion make up what nerve?

A

cochlear nerve

41
Q

describe the nerve pathway of the cochlear nerve

A

cochlear nuclei–> superior olivary and trapezoid nuclei in MO–> lateral leminscus–> inferior colliculi and medial geniculate bodies–> temporal lobe (broadmann 41,42)

42
Q

describe nerve pathway of vestibular nerve

A

axons carried to vestibular nuclear complex of MO–> cerebellum

PNS final (3 decks)

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