. The comparative anatomy of the domesticated animals. Veterinary anatomy. COLUMNAR epithelium. , Nucleus of the cell; 2, Membrane of the cell raised from its contents by the absorption of water. Fig. 145. upon each other. In stratified epithelium, the shape of the cells is not the same on the surface and beneath it, and it is named after the form of the superficial layer. The mucous derm or corium corresponds to that of the skin, as the epithelium corresponds to the epidermis. It is composed of connective (or areolar) tissue, whose thickness, elasticity, vascularity, and sensibility varies wi
. The comparative anatomy of the domesticated animals. Veterinary anatomy. COLUMNAR epithelium. , Nucleus of the cell; 2, Membrane of the cell raised from its contents by the absorption of water. Fig. 145. upon each other. In stratified epithelium, the shape of the cells is not the same on the surface and beneath it, and it is named after the form of the superficial layer. The mucous derm or corium corresponds to that of the skin, as the epithelium corresponds to the epidermis. It is composed of connective (or areolar) tissue, whose thickness, elasticity, vascularity, and sensibility varies with the situation and the func- tion of organs. The corium is thin and almost destitute of elastic fibres when applied to the bony walls of a cavity; on the contrary, it is thick, elastic, and slightly adherent when it lines organs which, like the stomach, oesophagus, and intestines, are capable of increasing or diminishing in capacity. The fasciculi of the connective tissue in the deeper layers of the corium are loosely united, but nearer the surface they lie closer; some- times they form, under the epithelium, an amorphous surface-layer, the basement (or limitary) membrane. The sub-epithelial face of the corium is scarcely ever smooth, but offers minute prolongations named villositiesoi papillce, w^hich are very varied in their form columnar and volume, and is more or less marked by "^ depressions designated follicles. The villi are observed on the deep-seated mucous mem- branes ; they are more particularly the vascular and absorbent organs. The papillae are found towards the natural apertures, and are rich in nerves; they are more especially the organs of sensibility. The follicles, lined by one or other form of cell, are exclusively organs of secretion. b. The second membrane met with in the walls of the hollow organs is of a muscular, and sometimes of a cartilaginous nature. The muscular mem- brane is formed of unstriped fibres whose slow contraction is involuntary. In
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectveterinaryanatomy
