. Kirkes' handbook of physiology . ation; layer c, consists chiefly of prickle or ridge and furrow cells; /, basement membrane;g, cells in cutis vera. (Cadiat.) sebaceous glands, and hair follicles; and on its surface are sensitive papilla:.The so-called appendages of the skin—the hair and nails—are modificationsof the epidermis. The epidermis is composed of several strata of cells of various shapes andsizes; it closely resembles in its structure the epithelium of the mucous mem-brane that lines the mouth or covers the cornea. The following four layersmay be distinguished: 392 EXCRETION The St
. Kirkes' handbook of physiology . ation; layer c, consists chiefly of prickle or ridge and furrow cells; /, basement membrane;g, cells in cutis vera. (Cadiat.) sebaceous glands, and hair follicles; and on its surface are sensitive papilla:.The so-called appendages of the skin—the hair and nails—are modificationsof the epidermis. The epidermis is composed of several strata of cells of various shapes andsizes; it closely resembles in its structure the epithelium of the mucous mem-brane that lines the mouth or covers the cornea. The following four layersmay be distinguished: 392 EXCRETION The Stratum lucidum, a bright homogeneous membrane, consisting ofsquamous cells closely arranged, in some of which a nucleus can be granulosum, consisting of one layer of flattened, fusiform, distinctlynucleated cells. Stratum Malpighii or Rete mucosum consists of many strataof cells. The deepest cells, placed immediately above the cutis vera, arecolumnar with oval nuclei, succeeded by a number of layers of more or less. Fig. 305.—Vertical Section of Skin. A, Sebaceous gland opening into hair follicle; B, mus-cular fibers; C, sudoriferous or sweat gland; D, subcutaneous fat; E, fundus of hair-follicle,with hair-papillffi. (Klein.) polyhedral cells with spherical nuclei; the more superficial layers are con-siderably flattened. The deeper surface of the rete mucosum is accuratelyadapted to the papilla? of the true skin, being, as it were, moulded on is very constant in thickness in all parts of the skin. The cells of the middlelayers of the stratum Malpighii are connected by processes, and thus formprickle cells, figure 28. The pigment of the skin, in the deeper cells of retemucosum, causes the various tints observed in different individuals and differ-ent races. The epidermis maintains its thickness in spite of the constant wear GLANDS OF THE SKIN 393 and tear to which it is subjected. The columnar cells of the deepest layerof the rete mucosum elongate, mult
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