1-a&p-vestib - Anatomy and Physiology of Balance...

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Anatomy and Physiology of Balance
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Vestibular Hair Cells Type I (aka inner) Type II (aka outer) With Kinocilium
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The Semicircular Canals posterior canal shares plane with contralateral anterior canal. horizontal canals share plane.
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Stimulated by Angular Acceleration greatest when fulcrum is within head induces relative motion of endolymph crista is displaced by fluid motion
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Responses of the Cristae All kinocilia are oriented in the same direction Crista in each pair of canals respond inversely to each other
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The Otolithic Organs Saccule: roughly vertical orientation, responds to acceleration components within saggital plane Utricle: horizontal (+ 30 deg.) orientation
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Excitation Patterns in the Utricle STRIOLA Posterior Anterior Medial
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Cranial Nerve VIII
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Vestibular Portion of C.N. VIII superior division: utricle, anterior part of inferior division: posterior part of saccule, and posterior canal to vestibular nuclei to cerebellum
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1-a&p-vestib - Anatomy and Physiology of Balance...

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