12 Vestibular System
Vestibular System

head turn to left, eyes stay focus on object

3 loops: semicircular canal
filled with endolymph fluid

otolith stones on top of hair cells move forward/backward with motion

Vestibular Dysfunction

vertigo: motion when there's no movement

2 CN 8 pushing eye toward middle of head, keep eye centered.
If one nerve is gone, other slowly pushes eye towards one side. When brain detects the error, it quickly jerks the eye in the opposite direction


peripheral: vestibular apparatus dysfunction in inner ear
central: brain stem lesions, strokes
Central Vs Peripheral

BPV common cause of peripheral

changing direction: when look left may have upbeat nystagmus, look right downbeat
lower pt down will get immediate nystagmus
skew deviation: one eye higher than other

lie down on table: delayed
Dix-Hallpike


Benign Positional Vertigo

debris moves hair cells when they shouldn't be moved
Vestibular Neuronitis

usually after cold
Meniere's Disease



Last updated
Was this helpful?