Vestibular System

Question 1

Turning the head to the left would cause action potential firing to what?

Answer 1

Increase in the left horizontal canal &
Decrease in the right horizontal canal

Question 2

Steps of vestibule-ocular reflex

Answer 2

Head turns left
Firing of primary vestibular neuron
Left medial rectus and right lateral rectus contract
Eyes move in opposite direction of head turn

Question 3

Nystagmus

Answer 3

Slow drift of eyes to one side followed by snap back in opposite direction

Question 4

Vestibular nuclei integrates inputs from where?

Answer 4

Vestibular organs
Visual system
Cerebellum

Question 5

Eye movements, postural reflexes, and spatial awareness are influenced by what?

Answer 5

Vestibular system

Question 6

Benign paroxysmal positional vertigo (BPPV) is caused by what?

Answer 6

Dislodged otoconia sloshing around in the semicircular canals

Question 7

When caloric testing elicits movement in only one eye there is likely a lesion where?

Answer 7

In the medial longitudinal fasciculus

Question 8

Key functions of vestibular system

Answer 8

Provide info about head movement
Maintains and stabilizes gaze
Maintains balance