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otolith
(redirected from Otoconia)

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia 0.01 sec.

otolith

Tiny calcareous deposit found in the ears of fishes, which are in contact with the sensory cushions supplied by the acoustic nerves. Their function is as an organ of balance.

Frequently otoliths are the only parts of a fish's anatomy to survive decay, and their variation affords a clue in many cases to the classification of the fish.



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Schuknecht proposed that BPPV occurs when otoconia irritate the ampulla of the posterior semicircular canal (the cupulolithiasis theory), but other theories exist, as well.
Near the semicircular canals are the utricle and saccule, which contain tiny particles called otoconia (o-toe-KOE-nee-uh).
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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