CHAPTER XI 



THE SKIN AND KIDNEYS 



196. The derma. The whole body is covered with a 

 coat of woven cells called the skin. The skin of man is 



from one sixteenth to 

 one eighth of an inch 

 in thickness. It is 

 made mostly of tough 

 cells like strings, and 

 contains more blood 

 tubes and nerves than 

 almost any other part 

 of the body. This 

 thick part is the true 

 skin. It is called the 

 derma or cutis. The 

 derma of animals when 

 tanned makes leather. 



The nerves of the skin 

 end in little pointed 

 shoots of derma called 



The skin (x 100). 



a dead layer of epidermis. 

 b growing layer of epidermis. 



c layer of cells containing the coloring matter p a pUfa f R ows o f 



OT tnR Qifin -* * 



of the skin. 

 d papilla. 

 e sweat gland. 

 / small blood tube. 

 g fibers of the derma. 

 h fat cells in the derma. 



pillae make the fine lines 

 upon the palms of the 

 hands. The derma is 

 bound loosely to the 

 muscles and deeper parts of the body so that it can move 



104 



