4.18 Vestibular 2 Flashcards Preview

7303 Neuroanatomy > 4.18 Vestibular 2 > Flashcards

Flashcards in 4.18 Vestibular 2 Deck (18):
1

What are the 2 otolithic organs sensitive to?

linear acceleration only

2

What are the 2 otolithic organs?

- utricle
- saccule

3

macula

entire receptor system

4

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

gel is displaced because of the otoconia

5

otoconia

- calcium carbonate crystals
- heavy, cause displacement

6

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

causes hair cells to bend in the opposite direction

7

utricle: which plane?

horizontal plane

8

saccule: which plane?

vertical plane

9

The utricle responds to

horizontal acceleration (car)

10

The saccule responds to

vertical acceleration (elevator)

11

The membranous labyrinth is filled with

- endolymph
- contains hair cell mechanoreceptors

12

2 streams of info

- action (dorsal) stream
- perception (ventral) stream

13

action stream function

- makes you aware of how you move your eyes
- directs eye movements (not actually moving them)

14

perception stream function

object recognition

15

What do eye movements require info about?

- head movement
- vision
- proprioception
- selected visual target

16

How are eye movements accomplished?

- by MLF
- reflexes
- unconscious visual information

17

Where does unconscious visual information come from (nucleus)?

superior colliculus

18

Goals of eye movements

- keep eyes stable during head movements
- direct gaze to a target