File:Quain's elements of anatomy (1882) (14576908188).jpg

Identifier: quainselementsofquai02 (find matches)
Title: Quain's elements of anatomy
Year: 1882 (1880s)
Authors: Quain, Jones, 1796-1865 Thomson, Allen, 1809-1884 Sharpey-Schäfer, E. A. (Edward Albert), Sir, 1850-1935, ed Thane, George Dancer, 1850-1930
Subjects: Human anatomy Anatomy
Publisher: New York : William Wood and co.
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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substance of this thickening the nerve-fibres pass to theedge of the ridge, and over it the epithelium is of an elongated columnarform (fig. 394), and is surmounted by long, conical, gradually taperingfilaments (auditory hairs (h)), which project stiffly into the cavity.These hairs are borne by the columnar epithelium-cells, a single hairprojecting from each cell, but under the influence of reagents they areapt to become broken near the base, and this splits up into fine fibrilswhich then appear as a bunch of cilium-hke filaments attached to the 454 THE EAE. free border of the cell (fig. 395, h, lb). The colnmnar cells, or hair cells,do not extend down to the basement membrane, but terminate short ofthis in a somewhat pointed extremity. They are directly connected bythis extremity with branches of the nerve-fibres which penetrate into theepithelium (fig. 395, n). This connection has been described by Eetziusin reptiles and there is little doubt it obtains in all vertebrates. Fig. 394.
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Pig. 394.—Longitudinal section of an ampulla theotjgh theSemi-diagrammatic (E.A.S.). CRISTA ACUSTICA. amp, cavity of the ampulla ; sc. c, semicircular canal opening out of it; c, connectivetissue attached to the wall of the membranous ampulla and traversing the perilymph ;c e, flattened epithelium of ampulla ; h, auditory hairs projecting from the columnar cellsof the auditory epithelium into the cupula, cv))- term. ; v, a vascula stria marking thelimit of the auditory epithelium on the crista ; n, nerve-fibres entering the base of thecrista and passing into the columnar cells. Between and beneath the columnar cells other cells are met with ofa different character. They take the form of long and comparativelyrigid fibres (fihre-cells of Eetzius) which extend thiough the Avholethickness ofthe epithelium, and are provided at one part of theircourse with a nucleated enlargement. This is always placed below thecolumnar cells, and in many it is close to the central end of the fibre.The f

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