STRUCTURE OF THE SKIN 



209 



skin, although the elimination of CO 2 and inorganic salts, and 

 especially of urea in some pathological conditions, is not to be 

 overlooked. 



Structure. The skin consists of an external covering, the 

 epidermis, with its modifications, hair and nails, and of the cutis 



Stratum corneum. 



Stratum lucidum. 

 Stratum granulosum. 



Stratum Malpighii. 



FIG. 60. Vertical section of the human epidermis. 

 The nerve-fibrils, n, b, stained with gold chloride. (Landois.) 



vera. Imbedded in the cutis vera are sebaceous and sweat glands 

 and hair-follicles. (Fig 61.) 



Epidermis. The epidermis consists of at least four layers 

 of epithelial cells. From above downward these are (i) the 

 stratum corneum, (2) the stratum lucidum, (3) the stratum granu- 

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