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KNES462_d7 copy - KNES 462 vestibular-realtionship between...

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KNES 462 1 KNES 462 © FK ‘08 27 Vestibular System I Provides sense of balance not really ‘dominant’ in our consciousness, unlike other senses (e.g., vision, smell, hearing)! crucial for postural reflexes & eye movements disruption of balance sense leads to dizziness and nausea, and to falls. reports to centers in – brainstem – cerebellum, somatosensory cortex KNES 462 © FK ‘08 28 Vestibular System II Location: inner ear housed in a bony labyrinth, lined with a membrane • (audition) vestibular division: responsible for balance 2 sac-like swellings (otolith organs) » utricle » sacculus 3 semicircular ducts KNES 462 © FK ‘08 29 Vestibular System: Structure Vestibular labyrinth rests in perilymph
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KNES 462 2 KNES 462 © FK ‘08 30 Otolith organs (utricle, sacculus) : detect linear acceleration ( ļ Ľ ) determine head position with respect to gravity Semicircular ducts: detect angular acceleration in 3D space Vestibular labyrinth is filled with
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