PART THIRD. 



ORGANS. 



THE SKIN". 



The skin consists of (1) the epidermis (or scarf skin), which every- 

 where covers and protects (2) the derma (corium or true skin). 



The epidermis varies greatly in thickness in different locations; 

 and in the thicker portions several layers may be differentiated. It 

 is composed entirely of cells, while the derma is fibrous. 



Stratum Gorneum, \ H L , | 



/Stratum Luciaum, } 



Stratum Granulosum } Malpighian Layer \ I 



Stratum of Prickle Cells, \ W ,| Muoomim 



5. Stratum of Elongate (Pigment) Cells, ) <J S 



The stratum corneum consists of old. exhausted, flattened, and 

 desiccated cells, which are constantly falling from the entire surface 

 of the body. Dandruff consists of impacted cells from this source. 

 Those portions most frequently exposed to friction, e. g., the palms 

 of the hands and soles of the feet, are protected by a corneous epider- 

 mal layer of great thickness. 



The stratum lucidum, or clear layer, presents cells in form not 

 unlike those in the preceding stratum; they are, however, translucent. 

 This is properly a part of the previous stratum, is often absent, and 

 frequently very difficult of demonstration. 



: The stratum granulosum, or granular layer, is composed of flat- 

 tened cells containing opaque granules. 



