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Tympanic duct

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Title: Tympanic duct  
Author: World Heritage Encyclopedia
Language: English
Subject: Cochlear duct, Auditory system, Auditory and vestibular anatomy, Organ of Corti, Cochlear cupula
Collection: Auditory System, Ear
Publisher: World Heritage Encyclopedia

Tympanic duct

Tympanic duct
Inner ear, with tympanic duct labeled near bottom.
Cross section of the cochlea (scala tympani labeled at bottom)
Latin Scala tympani
MeSH A09.246.631.246.848
Anatomical terminology

The tympanic duct or scala tympani is one of the perilymph-filled cavities in the inner ear of the human. It is separated from the cochlear duct by the basilar membrane, and it extends from the round window to the helicotrema, where it continues as vestibular duct.

The purpose of the perilymph-filled tympanic duct and vestibular duct is to hair cells attached to the basilar membrane and their stereocilia embedded in the tectorial membrane. The movement of the basilar membrane compared to the tectorial membrane causes the sterocilia to bend. They then depolarise and send impulses to the brain via the cochlear nerve. This produces the sensation of sound.

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