12 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
Meniere's Disease
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