. The comparative anatomy of the domesticated animals. Veterinary anatomy. Fis;. SQUAMOUS EPITHELIUM FROM the centre, and seconiary nucleated cells forming the body of the scale, Fis. 144 GENERAL CONSIDERATIONS ON THE DIGESTIVE APPARATUS. 327 A mucous membrane comprises a superficial or epithelial layer and a deep portion which constitutes the derm or chorion (cerium). _ The epiihelium^ is a very thin, inert pellicle, entirely composed of epithelial cells united by an almost insignificant quantity of amorphous matter (blastema). The cells are flat or polygonal, round or cylindxical, poly
. The comparative anatomy of the domesticated animals. Veterinary anatomy. Fis;. SQUAMOUS EPITHELIUM FROM the centre, and seconiary nucleated cells forming the body of the scale, Fis. 144 GENERAL CONSIDERATIONS ON THE DIGESTIVE APPARATUS. 327 A mucous membrane comprises a superficial or epithelial layer and a deep portion which constitutes the derm or chorion (cerium). _ The epiihelium^ is a very thin, inert pellicle, entirely composed of epithelial cells united by an almost insignificant quantity of amorphous matter (blastema). The cells are flat or polygonal, round or cylindxical, polyhedral, or very irregular in shape. In consequence of these diverse forms, there is pavement (or squamous), spherical (or spheroidal), and cylindrical or conical (or columnar) epithelium. If the cells are fm'nished with small filiform appendages, named vibratile cilia, the epithelium is then designated ciliated. When the cells arej&rranged in a single layer on the surface of the corium, the epithelium is said to be simple; the mouth. it is stratified when the cells are arranged in strata The large scale is magnified upon each other. In stratified epithelium, the 310 diameters, and exhibits shape of the cells is not the same on the surface " nucleus with nucleolus in 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 loo
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