Biology / Bio 2903 · Atom · ~20 seconds
Vestibular System: Utricle, Saccule, Semicircular Canals
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The vestibular system detects linear acceleration through the utricle and saccule, using gravity-pulled crystals to bend stereocilia, and detects angular acceleration through three semicircular canals.
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Fluid shifting within the semicircular canals as the head turns bends stereocilia and signals rotation direction.
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The semicircular canals detect changes in velocity, not velocity itself — steady motion produces no sensation once fluid settles.