. The anatomy of the human body. Human anatomy; Anatomy. STRUCTURE OF THE SKIN. 631 adherent surface of the skin, and more particularly opposite the areolas observed on that surface ; so that whenever the skin is stripped off for a certain extent, it either sloughs off, or its vitality is so greatly impaired as to be incapable of completing the process of cicatrization. An accurate idea is, perhaps, not generally entertained of the enormous quantity of nervous filaments and of the immense number of arteries which enter the skin, or of the number of veins which issue from it. Its importance, bo
. The anatomy of the human body. Human anatomy; Anatomy. STRUCTURE OF THE SKIN. 631 adherent surface of the skin, and more particularly opposite the areolas observed on that surface ; so that whenever the skin is stripped off for a certain extent, it either sloughs off, or its vitality is so greatly impaired as to be incapable of completing the process of cicatrization. An accurate idea is, perhaps, not generally entertained of the enormous quantity of nervous filaments and of the immense number of arteries which enter the skin, or of the number of veins which issue from it. Its importance, both in a healthy and in a diseased condition, is sufficiently explained by these anatomical facts regarding it. Structure of the Skin. The skin consists essentially of the cutis, dermis, or true skin {a, fig. 226); of the pa- pillcB, which project upon its external surface ; of the pigmentum, or colouring matter (6'); of the lymphatic network; and of the epidermis, or cuticle {b); as accessory parts, it also contains the sebaceous follicles, as well as arteries, veins, lymphatics, and nerves; and has connected to it the hairs and the nails. The Cutis or ChorioR.—The dermis, ckorioii, or cutis vera (a, fig. 226 ; e,fig. 227), is the fundamental part or the basis of the skin; and to it the skin owes p^ gofi its strength, extensibility, and elasticity. If the skin be regarded as formed of several distinct layers, the dermis constitutes the deepest of these. The thickness of the dermis varies in different parts, but is always in proportion to the amount of resistance which it is required to offer. Thus, in the cranium, it is very thick and dense ; on the face, generally, it is thinner than on the cranium, but not in every part of the face. Compare, for example, its density and thickness in the skin upon the lips with its tenuity and delicacy in that of the eyelids. On the trunk it is almost twice as thick behind as in front; and upon the penis, scrotum, and mamma it is much thinne
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