Vestibular Function

Question 1

Functions of vestibular reflexes

Answer 1

1. Maintain head position (VCR)

2. Keep eyes focused (VOR)

Question 2

VCR stands for?

Answer 2

Vestibulo-collic reflex

Question 3

VCR controls?

Answer 3

Neck mm. and posture

Question 4

VOR stands for?

Answer 4

Vestibulo-ocular reflex

Question 5

VOR controls?

Answer 5

Ocular mm.

Question 6

Otolith organs (saccule and utricle) are sensors for?

Answer 6

Liner motion

Question 7

SCC are sensors for?

Answer 7

Rotational motion

Question 8

1 non-sensory organ in vestibular labyrinth

Answer 8

Endolymphatic sac

Question 9

Structure holding sensory hair cells in saccule and ultricle

Answer 9

Macula

Question 10

Structure holding sensory hair cells in SCC

Answer 10

Crista

Question 11

Structure holding sensory hair cells in cochlea

Answer 11

Organ of Corti

Question 12

Hair cells (HC) are _____sensors

Answer 12

Mechanosensors

Question 13

Hair cells in the cristae reach into the?

Answer 13

Cupolla

Question 14

Hair cells in the maculae reach into the?

Answer 14

Otoconia-membrane

Question 15

What is otoconia-membrane?

Answer 15

Heavy glyco-protein matrix with calcium bicarb cystals

Question 16

What is endolymph?

Answer 16

KCL solution secreted by vestibular dark cells (VDC)

Question 17

What is perilymph?

Answer 17

NaCl solution

Question 18

Striola

Answer 18

Separates hair cells with opposite orientation

Question 19

VCR and VOR both integrate what types of sensory input?

Answer 19

1. Vestibular input
2. Visual input
3. Somatosensory input

Question 20

What leads to compensatory movements of the eyeballs (in order to stabilize image on retina)?

Answer 20

Differential stimulation of SCCs

Question 21

Nystagmus

Answer 21

Fast reset motions of the eyeball

Question 22

Nystagmus occurs in what direction?

Answer 22

Rotational (rotation to right = nystagmus to right)