Kirkes' handbook of physiology. / By W. Morrant Baker and Vincent Dormer Harris.

  • William Senhouse Kirkes
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Kirkes' handbook of physiology. / By W. Morrant Baker and Vincent Dormer Harris. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

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    Epithelial tissue is classified according as the cells composing it are arranged in a single layer when it is simple, or in several layers when it is called stratified or laminated, or in two or three layers occupying a position between the other two forms, when it is termed transitional. Of each form when there are several varieties they are named according to the shape of the cells composing it. A. Simple.—(i.) Squamous, scaly, pavement or tesselated ; (2.) Spheroidal or glandular ; (3.) Columnar, cylindrical, conical or goblet- shaped ; (4.) Ciliated. B. Transitional. C. Stratified. A. Simple.—Squamous Epithelitim (fig. 13).—Arranged as a Fig. 13.—SquamoHs epithelium sciil'-s from the inside of the mouth, x 260. (Henle.) Fig. 14.—Pl</ment celU from the retina. A, cells still cohering, seen on their sui-face; n, nu- cleus indistinctly seen. In the other cells the nucleus is concealed by the pigment granules. B, two cells seen in protile ; «, the outer or posterior part containing scarcely any pigment, x 370. (Henle.) single layer, this form of epithelium is found as («) the pigmentary layer of the retina, and forms the lining of (h) the interior of the serous and synovial sacs, (c) the alveoli of the lungs, and {d) of the heart, blood- and lymph-vessels. It consists of cells, which are flattened and scaly, with a more or less iiregular outline. In the ])igment cells of the retina, there is a deposit of pigment in the cell-substance. This pigment consists of miimte molecules of melanin, imbedded in the cell-substance and almost concealing the nucleus, which is itself transparent (fig. 14). In white rabbits and other albino animals, in which the pig- ment of the eye is absent, this layer is found to consist of coloni-- less pavement epithelial cells.
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