THE SKIN 



1153 



shaped areas (Fig. 864). The skin consists of two layers: a superficial layer, 

 the epidermis, and a deep layer, the corium or dermis. 



The Cuticle, Scarf Skin/ or Epidermis (Figs. 865 and 866) is composed of 

 layers of epithelium and is derived from the ectoderm. The epithelium is strati- 



FIG. 862.' Anterior surface. FIG. 863. Posterior surface. 



The general course of the connective-tissue bundles of the corium, determined by the direction assumed by the 

 linear clefts made in the skin when it is punctured by a round awl. (Langer.) 



fied, and is devoid of bloodvessels. Two layers can be readily made out, the 

 superficial or horny layer and the deeper or Malpighian layer. 



The horny layer (stratum corneuni) is formed by several layers of non-nucleated 

 scaly cells. The cells consist of keratin. The surface cells of the horny layers 



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