THE SKIN 



1155 



from the corium between the cells, and there is cement substance as well between 

 them. 



The Corium, Cutis Vera, Dennis, or True Skin (Figs. 866 and 870) is a con- 

 nective-tissue structure which arises from the mesoderm. It consists especially 

 of connective tissue and elastic fibres; it contributes elasticity to the skin, and is 

 the seat of the sense organs. The corium is composed of two layers, the papillary 

 and the reticular. 



Duct o/_ _~^r 

 sweat -gland' ~ 



x Tactile. fJL, 



corpuscle "S^SQ ^ j#3 

 *SOv " l ~ 



Duct of^ 

 swea< gland" "W^S^-S^^^fHT^ 



Stratum 

 corn eum 



-Stratum JiuiJum 



"""Stratum 

 S yranulostim 



} -Stratum Maljnyhti 



Stratum 

 germinativum 





Adipose tissue ^j$ 

 Artery 



FIG. 866. Diagrammatic sectional view of the skin. (Magnified.) 



The superficial or papillary layer or corpus papillare of the corium (stratum papil- 

 lare) lies just beneath the epidermis, contains the papillae, and is composed of a 

 network of fine bundles of fibrous tissue. The papillae are composed of fine 

 strands of connective tissue and elastic tissue. They project from the corium 

 beneath the epidermis and enter into depression's of the epidermis. They vary 

 greatly in size, averaging J-^Q- of an inch in height and ^ir f an mcn m width 

 at the base. In the face, especially in the eyelids, they are insignificant. Qn the 

 glans penis, the palms of the hands, and the soles of the feet, and in the nipples, 

 they are large. In the palmar surfaces of the hands and fingers and the plantar 

 surfaces of the feet and toes they produce permanent ridges (Fig. 869). A ridge 

 is composed of two or more rows of papilla?, and the ducts of sweat glands emerge 



