Vestibular System

Question 1

Utricle and Saccule

Answer 1

Static position of the head with respect to gravity and linear acceleration
(Utricle - car movement)
(Saccule- Elevator)

Question 2

Semicircular Canals

Answer 2

Signal rotation and angular acceleration
(head rotation)

Question 3

Opening of stretch activated Channels

Answer 3

movement towards the kinocilium, stimulates the opening of the stretch activated channels
- K and Ca enter and depolarize the hair cells

Question 4

Hair cell releases glutamate

Answer 4

Depolarization- deflection towards the kinocilium
Hyperpolarization- deflection away from the kinocilium

Question 5

Endolymph

Answer 5

Surrounds Hair Cell Cilia (high in potassium)

Question 6

Perilymph

Answer 6

Surrounds hair cell body (High in Sodium)

Question 7

Cupula

Answer 7

Gelatinous mass surrounding cilia, sensitive to angular, but not linear acceleration.

Question 8

Meniere Disease

Answer 8

-buildup of endolymph in the ear
- Xtreme vertigo, tinnitus, nystagmus, and possible hearing loss
- effects one ear usually

Question 9

Benign Paroxysmal Positional Vertigo (BPPV)

Answer 9

• detachment of otoconia in the utricle, allowing them to enter the ampulla

Question 10

Employ Maneuver

Answer 10

Canalith Repositioning Procedure (CRP)