Vestibular

Question 1

Semicircular canals
(cristae ampullares)

Answer 1

The crista ampullaris is the sensory organ of rotation. The function of the crista ampullaris is to sense angular acceleration and deceleration.

Question 2

Function of utricle

Answer 2

Detects linear acceleration in horizontal plane

Question 3

Function of saccule

Answer 3

Detects linear acceleration in vertical plane and gravity

Question 4

Endolymph has a high concentration of

Answer 4

[K+]

Question 5

Mmt TOWARD kinocilium – excites hair cell

Answer 5

Excites hair cell

Question 6

Mmt AWAY from kinocilium

Answer 6

Inhibits hair cell

Question 7

In mechanotransduction what happens

Answer 7

K+ entry depolarizes hair cell
* Depolarization of hair cell
opens voltage gated Ca2+
channels

Question 8

What does the calcium trigger

Answer 8

Ca2+ influx triggers the
release of neurotransmitter
from ribbon synapse
(glutamate) and the Signal propagated to CNS

Question 9

What does the vestibulospinal tracts do?

Answer 9

Mediation of reflex activity associated with vestibular input and extensor muscle activity

Question 10

What is referred pain?

Answer 10

Referred pain is the result of visceral pain afferents synapsing onto the same spinal neurons that receive somatic input