THE SKIN. 



477 



rior part of the body of the penis. They also exist under the skin 

 of the areola around the nipple of the female, forming circular 



of an inch thick, and 

 Fig. 317. 



bundles of a yellowish-red color, even J 

 extending both circularly and perpendicu- 

 larly into the nipple itself. But smooth 

 muscular fibres are also found in the su- 

 perficial portions of the corium, and, in 

 fact, in every part where hairs occur (ar- 

 rectores pili, Eylandt,) forming flat bundles 

 TsW to ^io- of an inch bro^d, which are 

 placed singly or in pairs near the upper 

 part of the hair-follicles and sebaceous fol- 

 licles. Eylandt finds the bundles to be 

 only g^nnr f an i ncn thick, and has never 

 seen more than one pass to a hair-follicle. 

 Henle makes them 3^00 of an inch thick. 

 Eising from the superficial part of the co- 

 rium, they extend obliquely outwards, and 

 .are inserted into the hair-follicles close 

 behind, and near the base of the sebaceous 

 glands (p. 267 and Fig. 135). 



The inner surface of the corium is rough 

 and areolated, to correspond with the 

 outer surface of the superficial fascia into 

 which it merges. Its external surface is 

 also very far from being level, from the 

 development here of the tactile papillae. 

 The reddish-gray, external, superficial por- 

 tion of the corium, containing the upper 

 portion of the hair-follicles and cutaneous 

 glands, and the terminal expansions of the 

 vessels and nerves of the skin, is some- 

 times called the papillary portion of the 

 corium. The tactile papillce, its most im- 

 portant element (Fig. 318), are small, se- 

 mi-transparent, flexible, but tolerably solid 

 elevations of the external surface of the 

 corium, usually of a conical or clavate 

 form, but sometimes presenting numerous passing to the surface. (Magnified 



40 diameters.) 



Vertical section of the skin of 

 sole. a. Cuticle ; the deep layers 

 (stratum Malpighianum) more co- 

 lored than the upper, and their 

 particles rounded ; the superficial 

 layers more and more scaly. I. 

 Papillary portion. c. Principal 

 portion of corium. d. Sweat-gland 

 lying in a cavity on the deep snr ; 



