Vestibular System

Question 1

Three vestibular system functions

Answer 1

1. Detection of head motion
2. Adjust body position
3. Stabilize the eyes in response to movements

Question 2

Where does perilymph connect to CSF

Answer 2

Cochlear aquaduct

Question 3

What produces endolymph

Answer 3

Stria vascularis

Question 4

Perilymph is of similar composition to

Answer 4

CSF

Question 5

Where is endolymph reabsorbed

Answer 5

Endolymphatic duct & canal to sigmoid sinus to venous blood

Question 6

Macule senses

Answer 6

Linear acceleration and gravity

Question 7

Direction of hair cells in macula

Answer 7

Multiple directions

Question 8

What do hair cells in the macula protrude into

Answer 8

Gelatinous mass

Question 9

What are otoconia

Answer 9

CaCO3 crystals in the nacule

Question 10

2 parts of the macula

Answer 10

Utricle and saccule

Question 11

What do cristae sense

Answer 11

Angular acceleration

Overlap between the ears

Question 12

Parts of the cristate

Answer 12

3 semi-circular cannals

Question 13

Capula

Answer 13

Gelatinous mass that protrudes into ampulla of semi-circular canals

Question 14

Hair cells in the semi-circular canals are polarized

Answer 14

in 1 direction

Question 15

Nystagmus
First direction:
Slow direction:

Answer 15

Sense of spinning dues to difference in activity between semi-circular canals
Slow direction: Direction of under active neurons
Fast direction: Direction of spinning or overactive

Question 16

Pathway from Vestibular Afferants

Answer 16

Afferents from macula & cristae
Vestibular/Scarpa's Ganglion 
Vestibular nuclei in medullary pontine junction
Ventral posterior nucleus
Cortex

Question 17

Vesibular nuclei get input from

Answer 17

1. Cerebellum
2. Spinal cord (proprioceptive nuclei)
3. Vestibular ganglia