4.18 Vestibular 2

Question 1

What are the 2 otolithic organs sensitive to?

Answer 1

linear acceleration only

Question 2

What are the 2 otolithic organs?

Answer 2

• utricle

- saccule

Question 3

macula

Answer 3

entire receptor system

Question 4

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

Answer 4

gel is displaced because of the otoconia

Question 5

otoconia

Answer 5

• calcium carbonate crystals

- heavy, cause displacement

Question 6

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

Answer 6

causes hair cells to bend in the opposite direction

Question 7

utricle: which plane?

Answer 7

horizontal plane

Question 8

saccule: which plane?

Answer 8

vertical plane

Question 9

The utricle responds to

Answer 9

horizontal acceleration (car)

Question 10

The saccule responds to

Answer 10

vertical acceleration (elevator)

Question 11

The membranous labyrinth is filled with

Answer 11

• endolymph

- contains hair cell mechanoreceptors

Question 12

2 streams of info

Answer 12

• action (dorsal) stream

- perception (ventral) stream

Question 13

action stream function

Answer 13

• makes you aware of how you move your eyes

- directs eye movements (not actually moving them)

Question 14

perception stream function

Answer 14

object recognition

Question 15

What do eye movements require info about?

Answer 15

• head movement
• vision
• proprioception
• selected visual target

Question 16

How are eye movements accomplished?

Answer 16

• by MLF
• reflexes
• unconscious visual information

Question 17

Where does unconscious visual information come from (nucleus)?

Answer 17

superior colliculus

Question 18

Goals of eye movements

Answer 18

• keep eyes stable during head movements

- direct gaze to a target