70 PRACTICAL MICROSCOPY. 



lae over the entire surface of the body. These papillae are covered 

 with a basement membrane, and are protected from undue irritation 

 by the epidermal layers. 



The subcutaneous cellular tissue (upon which the true skin rests) 

 consists of fibrillated connective-tissue with elastic elements, from 

 which strong interlacing bands are formed. These, in the deeper 

 parts, form septa which support lobules of adipose tissue. These iso- 

 lated collections of adipose tissue, when elongated and placed verti- 

 cally to the surface, constitute the fat columns of Satterthwaite. 



FIG. 54. VERTICAL SECTION OF THE DERMA, OR TRUE SKIN. 



A, A. Line of elongate cells belonging to the epidermis. 



B, B, B. Summits of three papillae of the true skin. 



C, C, C. Portions of capillary loops in the papillae. 



D, D. Nerve loops, tactile corpuscles. X 250. 



The blood-vessels supplying the skin may be seen in vertical sec- 

 tions, in the subcutaneous tissue. Branches from, these are sent to 

 the papillae, where they terminate in delicate, interlacing loops of 

 capillaries. 



Medullated nerves are also sent to the papillae ; and in certain lo- 

 ations, they may be seen to terminate in tortuous structures the 



