. Kirkes' handbook of physiology . tion the cells are pushed further apart, and the connecting fibrilsor prickles are elongated and more clearly visible. The columnar cells of the deepest layer are distinctly nucleated; theymultiply rapidly by division; and as new cells are formed beneath, they pressthe older cells forward, to be in turn pressed forward themselves toward the sur-face, gradually altering in shape and chemical composition until they die andare cast off from the surface. 28 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES Stratified squamous epithelium is found in the following si
. Kirkes' handbook of physiology . tion the cells are pushed further apart, and the connecting fibrilsor prickles are elongated and more clearly visible. The columnar cells of the deepest layer are distinctly nucleated; theymultiply rapidly by division; and as new cells are formed beneath, they pressthe older cells forward, to be in turn pressed forward themselves toward the sur-face, gradually altering in shape and chemical composition until they die andare cast off from the surface. 28 CELL DIFFERENTIATION AND THE ELEMENTARY TISSUES Stratified squamous epithelium is found in the following situations: the epidermis, covering the whole of the external surface of the body;2. Covering the mucous membrane of the nose, tongue, mouth, pharynx, andesophagus; 3. As the conjunctival epithelium, covering the cornea; 4. Liningthe vagina and the vaginal part of the cervix uteri. Stratified Columnar Epithelium. In this type of epithelium, the surfacecells alone are columnar, the deeper cells being irregular in shape From. <m Fig. 28.—Epithelial Cells from the Stratum Spinosum of the Human Epidermis, ShowingIntercellular Bridges. X 700. (Szymonowicz.) the surface cells long processes extend down among the underlying type of epithelium is usually ciliated, as in the trachea, bronchi, etc.,but may be non-ciliated, as in portions of the human male urethra. Transitional Epithelium. This is a stratified epithelium consisting of onlythree or four layers of cells. The superficial cells are large and flat, often
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