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otolith |
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otolith [′ōd·ə‚lith] (anatomy) A calcareous concretion on the end of a sensory hair cell in the vertebrate ear and in some invertebrates. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Displacement of calcite fragments from the degenerating otoconia into the semicircular canals is known to be responsible for this process. Vertigo is common during the acute stage of a unilateral vestibular lesion, but also may manifest itself through displaced otoconia (benign paroxysmal positional vertigo [BPPV]) of acute brain stem lesions affecting the root entry zone of the peripheral vestibular neurons or the vestibular nuclei. The hair cells of the otolithic organs are blanketed with a jelly-like layer studded with tiny calcium stones called otoconia. |
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