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cochlea

cochlea Part of the inner ear of mammals, birds, and some reptiles that transforms sound waves into nerve impulses. In mammals it is coiled, resembling a snail shell, and is divided by membranes into three parallel canals (see illustration): the middle cochlear duct (scala media) and two outer canals – the vestibular canal (scala vestibuli) and the tympanic canal (scala tympani) – formed from one long canal folded on itself at a bend at the apex of the cochlea. The small opening at this point, where the vestibular and tympanic canals communicate, is called the helicotrema. The cochlear duct is filled with a fluid (see endolymph) and contains the organ of Corti, which houses the sound receptors. The other two canals also contain a fluid (see perilymph). Sound-induced vibrations of the oval window are transmitted through the perilymph and endolymph and stimulate hair cells in the organ of Corti. These in turn stimulate nerve cells that transmit information, via the auditory nerve, to the brain for interpretation of the sounds.

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"cochlea." A Dictionary of Biology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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cochlea

coch·le·a / ˈkōklēə; ˈkäk-/ • n. (pl. -le·ae / -lēˌē; -lēˌī/ ) the spiral cavity of the inner ear containing the organ of Corti, which produces nerve impulses in response to sound vibrations. DERIVATIVES: coch·le·ar adj. ORIGIN: mid 16th cent. (used to denote spiral objects such as a spiral staircase and an Archimedean screw): from Latin, ‘snail shell or screw,’ from Greek kokhlias. The current sense dates from the late 17th cent.

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"cochlea." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"cochlea." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cochlea-0

"cochlea." The Oxford Pocket Dictionary of Current English. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cochlea-0

cochlea

cochlea Fluid-filled structure in the inner ear. It has a shape like a coiled shell, and is lined with hair cells which move in response to incoming sound waves, stimulating nerve cells to transmit impulses to the brain. Different groups of hair cells are stimulated by different pitches of sound.

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"cochlea." World Encyclopedia. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"cochlea." World Encyclopedia. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/cochlea

"cochlea." World Encyclopedia. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/cochlea

cochlea

cochlea Part of the inner ear of some reptiles, birds, and mammals. It is concerned with the analysis of the pitch of received sound. In mammals other than Monotremata it is spirally coiled.

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"cochlea." A Dictionary of Zoology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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cochlea

cochlea (kok-liă) n. the spiral organ of the labyrinth of the ear, which is concerned with the reception and analysis of sound.
cochlear (kok-li-er) adj.

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"cochlea." A Dictionary of Nursing. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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cochlea

cochlea spiral cavity of the internal ear. XVII. — L. coc(h)lea snail-shell, screw — Gr. kokhlías, prob. rel. to kógkhē CONCH.

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"cochlea." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

"cochlea." The Concise Oxford Dictionary of English Etymology. . Encyclopedia.com. (August 23, 2017). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cochlea-1

"cochlea." The Concise Oxford Dictionary of English Etymology. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cochlea-1

cochlea

cochlea (kŏk´lēə): see ear.

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"cochlea." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"cochlea." The Columbia Encyclopedia, 6th ed.. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cochlea

cochlea

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"cochlea." Oxford Dictionary of Rhymes. . Encyclopedia.com. 23 Aug. 2017 <http://www.encyclopedia.com>.

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"cochlea." Oxford Dictionary of Rhymes. . Retrieved August 23, 2017 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/cochlea