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An appendage of the labyrinth of the internal ear, which is elongated and coiled into a spiral in mammals. See Ear.

An appendage of the labyrinth of the internal ear, which is elongated and coiled into a spiral in mammals. See Ear.

The part of the internal ear that is concerned with hearing. It forms the anterior part of the labyrinth, is conical, and is placed almost horizontally anterior to the vestibule.

A cone-shaped cavity in the petrous portion of the temporal bone, forming one of the divisions of the labyrinth or internal ear; it consists of a spiral canal making two and a half turns around a central core of spongy bone, the modiolus; this spiral canal of the cochlea contains the membranous cochlea or ductus cochlearis in which is the organ of Corti, one of the terminal auditory apparatuses.

Anterior portion of internal ear.

A spiral-shaped cavity of the internal ear; the screw.

A division of the ear spirally coiled like a snail's shell.

Anatomists have given this name to the most anterior of the three cavities, which constitute the labyrinth of the ear, the Pelvis Au'rium, Concha auris inter'na seu Labyrinthi, Cav'itas cochlea'ta seu buccina'ta, Antrum buccino'sum, Troch'lea labyrinth'i: - and that of Scala of the Cochlea, (F.) Rompes du limacon, to two spiral cavities in the interior of the cochlea. One of these scalae terminates at the Fenes'tra rotun'da, and is called Scala tympani: the other opens at the anterior and inferior part of the vestibule: it is called Scala vestib'uli.

Spiral cavity of the internal ear.

The third division of the osseous labyrinth of the internal ear. It presents a canal between 28 and 30 mm. long, gradually tapering toward its upper end, turning 2½ times round on its axis, and showing on cross section the form of a garden snail. It communicates with the vestibule by a spacious opening and with the tympanic cavity by means of the fenestra rotunda.