4.18 Vestibular 2 Flashcards

1
Q

What are the 2 otolithic organs sensitive to?

A

linear acceleration only

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2
Q

What are the 2 otolithic organs?

A
  • utricle

- saccule

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3
Q

macula

A

entire receptor system

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4
Q

What happens as you move your head (gel, otoconia)

A

gel is displaced because of the otoconia

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5
Q

otoconia

A
  • calcium carbonate crystals

- heavy, cause displacement

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6
Q

What happens to hair cells in the otolithic organs with acceleration?

A

causes hair cells to bend in the opposite direction

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7
Q

utricle: which plane?

A

horizontal plane

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8
Q

saccule: which plane?

A

vertical plane

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9
Q

The utricle responds to

A

horizontal acceleration (car)

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10
Q

The saccule responds to

A

vertical acceleration (elevator)

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11
Q

The membranous labyrinth is filled with

A
  • endolymph

- contains hair cell mechanoreceptors

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12
Q

2 streams of info

A
  • action (dorsal) stream

- perception (ventral) stream

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13
Q

action stream function

A
  • makes you aware of how you move your eyes

- directs eye movements (not actually moving them)

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14
Q

perception stream function

A

object recognition

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15
Q

What do eye movements require info about?

A
  • head movement
  • vision
  • proprioception
  • selected visual target
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16
Q

How are eye movements accomplished?

A
  • by MLF
  • reflexes
  • unconscious visual information
17
Q

Where does unconscious visual information come from (nucleus)?

A

superior colliculus

18
Q

Goals of eye movements

A
  • keep eyes stable during head movements

- direct gaze to a target