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cochlea

Definitions

  • WordNet 3.6
    • n cochlea the snail-shaped tube (in the inner ear coiled around the modiolus) where sound vibrations are converted into nerve impulses by the organ of Corti
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Webster's Revised Unabridged Dictionary
    • n Cochlea (Anat) An appendage of the labyrinth of the internal ear, which is elongated and coiled into a spiral in mammals. See Ear.
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Century Dictionary and Cyclopedia
    • n cochlea A winding staircase.
    • n cochlea In anatomy, a part of the inner ear in most vertebrated animals. Its shape in man and most other mammals resembles a snail-shell; hence the name. In the petrous bone a canal winds about a central conical pillar of bone, the modiolus, and contains a hollow process of the membranous labyrinth; the latter follows the turns of the canal nearly to the top. To these structures taken together the name of cochlea is given. The process of the membranous labyrinth is triangular in cross-section, with its base applied to the outer wall of the canal and the apex attached to a spiral crest of bone, the lamina spiralis ossea, projecting from the inner side of the canal. It thus separates the bony canal into two portions, in addition to its own lumen, the scala vestibuli a bove and the scala tympani below. The lumen of the process itself is called the canalis cochlearis, its floor is called the basilar membrane, and its roof the membrane of Reissner. Its cavity is connected with the sacculus by the canalis reuniens. The essential structures of the cochlea, the rods of Corti and the hair-cells, are on the upper side of the basilar membrane, and to them is distributed the cochlear branch of the auditory nerve. See cut under ear.
    • n cochlea In botany, a closely coiled legume.
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Chambers's Twentieth Century Dictionary
    • n Cochlea kok′le-a a spiral-shaped shell, esp. the snail-shell:
    • n Cochlea kok′le-a (anat.) the spiral cavity of the ear
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Etymology

Webster's Revised Unabridged Dictionary
L., a snail, or snail shell, Gr. kochli`as a snail, fr. ko`chlos a shellfish with a spiral shell
Chambers's Twentieth Century Dictionary
L.,—Gr. kochlias, a snail.

Usage

In literature:

My cochlea struck twelve noon and a HUD appeared with my weekly backup reminder.
"Down and Out in the Magic Kingdom" by Cory Doctorow
From one side of this vestibule, or central hall, the three semicircular canals pass off, and from the other side, the cochlea.
"A Practical Physiology" by Albert F. Blaisdell
There is no cochlea as in the mammalian ear.
"Harvard Psychological Studies, Volume 1" by Various
Indirectly connected with the main sac is a spirally-twisted portion, resembling a snail shell in form, the cochlea.
"Text Book of Biology, Part 1: Vertebrata" by H. G. Wells
The FENESTRA ROTUNDA serves to establish a communication between the tympanum and the cochlea.
"A Treatise on Anatomy, Physiology, and Hygiene (Revised Edition)" by Calvin Cutter
Cochlea, its function, i.
"History of the Intellectual Development of Europe, Volume II (of 2)" by John William Draper
The very tortuous cavity of the inner ear, comprising the vestibule, semicircular canals, and the cochlea.
"A Treatise on Physiology and Hygiene" by Joseph Chrisman Hutchison
The bony labyrinth is composed of the vestibule, the semicircular canals and the cochlea.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 9" by Various
He also described minutely the circular and oval windows and their communication with the vestibule and cochlea.
"The Century of Columbus" by James J. Walsh
The labyrinth consists of the vestibule, the cochlea and the semicircular canals.
"Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 7" by Various
It is also known that there are no rods of Corti in the cochlea of birds, which are capable nevertheless of appreciating pitch.
"Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2" by Various
Lewise purpurae minores, nerites, cochleae, Tellinae.
"The Works of Sir Thomas Browne" by Thomas Browne
The cavity of the cochlea is filled with a fluid.
"A Civic Biology" by George William Hunter
Stretched across within the cochlea are some 3000 fibers or strings.
"Physics" by Willis Eugene Tower
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In news:

The array of electrodes, which will ultimately stimulate the auditory nerve, must be threaded into the cochlea, a fluid-filled, spiral structure of the inner ear.
Westerberg tells the nurse to note the time when he pierces the cochlea .
"Hearing with cochlear implants is different than the way we hear with all the hairs that vibrate in the cochlea, " he said, (but) within a couple years, he should be able to function just like anyone else.
They are electronic devices, typically covered by health insurance, which bypass damaged hair cells in the inner ear, or cochlea, and stimulate the hearing nerve directly.
What's implanted inside the ear, into the cochlea, is the electrode array.
"The sound is entered through the external, travels down into the electrode array and then the electrode array is stimulating different areas of the cochlea, " Palmese said.
Hearing loss ultimately is about hair loss: the death of the tiny hairs that line the cochlea of the inner ear.
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In science:

The cochlea of the inner ear contains about 16000 specialized sensory cells, called hair cells, which are able to detect sounds at a range of frequencies from 50H z to 40000Hz.
Mechanical oscillations at the cellular scale
The mechanical response of the basilar membrane, which is the structure inside the cochlea that contains the hair cells, has been measured as a function of frequency and amplitude of sound stimuli .
Mechanical oscillations at the cellular scale
The physical mechanisms for oscillations generated by molecular motors in a cilium therefore could cover the audible frequency range by using a simple morphological gradient in the cochlea.
Mechanical oscillations at the cellular scale
When the sound, as a series of alternating compressions and rarefactions of air, propagates and reaches our ears, the variation of pressure in the air is transferred via external ear and ear canal to the ear drum, ear bones, and cochlea in the inner ear where the vibration signal is processed.
Music in Terms of Science
In order to detect the sounds of the outside world, hair cells in the cochlea operate as nanosensors which transform acoustic stimuli into electric signals.
A simple mechanism for balancing at the border of instability with applications to persistent neural activity
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