CHAPTER XVI. 

 THE SKIN. 



THE skin consists of a deeper, fibrous portion, the corium, or true 

 skin, and a superficial, epithelial layer, the epidermis. As a part 

 of the latter, and developing from it, the skin contains two sorts 

 of glands, the sebaceous and the sweat-glands, and two kinds of 

 appendages, the hairs and nails. 



The corium is composed of vascularized fibrous tissue, which is 



FIG. 173. 



Section of skin perpendicular to the surface. (Arloing.) a, horny layer of the epidermis ; 

 b, rete mucosum ; c, surface of the corium ; d, sebaceous gland ; e, areolar tissue of the 

 corium; /, hair-shaft -within the hair-follicle; g, lobule of adipose tissue in the subcu- 

 taneous tissue; h, sweat-gland ; mh, arrector pili ; p, papilla of the corium extending into 

 the rete mucosum. The lower limit of the corium is not marked by a plane parallel to 

 that of the surface of the skin. The corium may be said to end where the fat of the sub- 

 cutaneous tissue begins. 



made up of bundles loosely arranged in its deeper portions, where it 

 becomes continuous with the subcutaneous areolar tissue, and contains 



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