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Neuro 2 > Vestibular A&P > Flashcards

Vestibular A&P Flashcards

1
Q

what 3 primary brain structures does the vestibular system project info to?

A
  • cortex
  • brainstem
  • cerbellum
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2
Q

what are the 3 primary functions of the peripheral vestib system?

A
  • stabilize visual images on the fovea of the retina during head movement to allow for clear vision
  • maintain postural stability, esp during head movement
  • provide info for spatial orientation
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3
Q

the utricle detects movement in what plane?

A

horizontal

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4
Q

the saccule detects movement in what plane?

A

vertical

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5
Q

where are the stereocilia found in the utricle?

A

on the floor

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6
Q

how is the kinocilium positioned in the utricle?

A

towards midline

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7
Q

where are the stereocilia found in the saccule?

A

on the medial wall

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8
Q

how is the kinocilium positioned in the saccule?

A

towards lateral edges

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9
Q

the semicircular canals relay info re: ____ of the head

A

angular velocity

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10
Q

T/F: the endolymph in the SCCs is gravity dependent

A

false

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11
Q

how are direction of endolymph movement and direction of rotation related in the SCCs?

A

they’re opposite (ex: head rotates L, fluid moves R)

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12
Q

the hair cells in the SCCs are sensitive to ____ movements only

A

angular

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13
Q

utriculopedal cupular displacement is excitatory for the ____ canal and inhibitory for the ____ canal

A
  • excitatory for horizontal

- inhibitory for A/P

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14
Q

utriculofugal cupular displacement is excitatory for the ____ canal and inhibitory for the ____ canal

A
  • excitatory for A/P

- inhibitory for horizontal

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15
Q

what artery supplies the vestibular labyrinth?

A

labyrinthine artery

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16
Q

what artery does the labyrinthine artery originate from?

A

AICA (sometimes branches straight off basilar a.)

17
Q

what are the 2 branches of the labyrinthine artery?

A
  • anterior vestibular a.

- common cochlear a. (main cochlear a. + vestibulocochlear a)

18
Q

what structures are supplied by the anterior vestibular a?

A
  • utricle
  • vestibular n.
  • ampullae of ant and horizontal SCC
19
Q

what structures are supplied by the common cochlear a?

A
  • cochlea
  • ampulla of post SCC
  • saccule
20
Q

what is significant about the labyrinthine artery?

A

it is HIGHLY susceptible to ischemia

21
Q

what does the VOR do?

A

generates eye movements that enable clear vision while head is in motion

22
Q

what does the VSR do?

A

generates compensatory body movement to maintain head and postural stability

23
Q

what does the VCR do?

A

act on neck musculature to stabilize the head

24
Q

what does the COR do?

A
  • interacts closely with VOR, can supplement

- eye movements driven by neck proprioceptors

25
Q

what does the CSR do?

A
  • changes in limb position driven by neck afferent activity

- can supplement VSR

26
Q

what does the CCR do?

A
  • help stabilize head on body
  • afferent input from change in neck position (stretch) leads to contra. reflexive contraction of appropriate neck muscles
27
Q

what are the 4 sets of vestibular subnuclei?

A
  • lateral nucleus
  • medial nucleus
  • superior nucleus
  • inferior nucleus
28
Q

what is the job of the lateral nucleus?

A

principle vestibular relay

29
Q

what is the job of the medial nucleus?

A

VOR and VSR relay

30
Q

what is the job of the superior nucleus?

A

VOR relay

31
Q

what is the job of the inferior nucleus?

A

cerebellar and RF relay

32
Q

describe the lateral vestibulospinal tract

A
  • travels to thoracic SC to extensor muscles
  • head/body position in space
  • walking upright
  • righting and equilibrium reactions
33
Q

describe the medial vestibulospinal tract

A
  • travels to cervical SC to extensor muscles
  • head movements
  • integrates head and eye movements
34
Q

T/F: there is no primary vestibular cortex

A

true

35
Q

describe the parieto-insular vestib cortex (PIVC)

A
  • receives input from cerebellum and vestib nuceli via thalamus
  • visual, somatosensory, and vestib integration
  • optokinetic nystagmus
36
Q

describe the medial superior temporal region

A
  • visuo-vestibular integration

- self-motion perception

37
Q

describe the ventral intraparietal region

A
  • spatial orientation

- proprioceptive, auditory, visual, tactile, vestib integration

Neuro 2 (6 decks)

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