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Vestibular System (Peripheral Components (Membraneous Labyrnth (Otolith…
Vestibular System
Peripheral Components
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Membraneous Labyrnth
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Endolymph
(within membraneous labyrinth)
:arrow_up::arrow_up: K+
Low Na+ # # #
Perilymph
(between bony & membraneous labyrinth)
:arrow_down::arrow_down: K+
High Na+ (similar to CSF; continuous w/ subarachnoid space)
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Meniere's Disease
:arrow_up:Endolymph Pressure
Membranous Labrynth distended
Sx: Vertigo, Nystagmus, Nausea, Tinnitus, Hearing Loss
Tx: Diuretics, salt-restriction, endolymph shunt #
Rx: Gentamicin
(ototoxic antibiotic; inject low dose, destroys some hair cells)
Semicircular Canal Dehiscence
Temporal bone over canal thins
Opening in dura mater
*Ant. & Post canals most at risk
Sx: Vergigo, Nystagmus, Oscillopsia
Tullio Phenomenon
Tx: Bone cement, Soft tissue graft #
Benign Paroxysmal Positional Vertigo
Sudden onset, short duration, provoked by change in head position
*Otoconia crystals become dislodged from Utricle :arrow_right: Posterior Canal :arrow_right: Crista Ampularis affected
Sx: Vertigo, Nausea, Nystagmus #
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Vestibular Neuritis
Herpes Simplex causes inflamm. in
- Mem. Labrynth, 2. Vestibular N., 3. Vestibular Gang.
Sx: Severe Vertigo # # #
Vestibular Schwannoma
Benign tumor in Schwann Cells myelinating CN VII
Sx: Hearing loss, Tinnitus #