TITK SKTX AXD FTS APPEXDAGES 



387 



white and elastic fibres with connective-tissue cells in \arying num- 

 bers. The fibres run lor the most part parallel to the surface of the 

 skin. ^w 



The pars papillaris is similar in structure to the precedingT^ut 

 both white and elastic fibres are finer and more closely arranged. 

 Externally this layer is marked by minute folds which are visible to 

 the naked eye, and can be seen intersecting one another and enclos- 

 ing small irregular areas of skin. In tlic thick skin of the palms and 

 soles these furrows arc close together and parallel, while between 

 them are long corresponding ridges. In addition to the furrows and 



A\ 



Bl 



C 



[ 



Fig. 272. — Thick Vertical Section through Skin of Finger Tip. (Merkel-Henle.) 

 A, Epidermis; B, derma; C, subcutis. a, Stratum corneum; b, duct of sweat gland; c, 

 stratum lucidum; d, stratum germinativum; e, papilla of derma; /, derma; g, blood- 

 vessel; h, sweat gland; i, fat lobule; p, sweat pore. 



ridges the entire surface of the corium is beset with minute papillae. 

 These vary in structure, some ending in a single point — simple pa- 

 pillm — others in several points — compound papillcE; some containing 

 blood-vessels — vascular papillcs; others containing special nerve 

 terminations — nerve papilla (Fig. 273). 



Smooth muscle cells occur in the corium in connection with the 

 sweat glands. In the skin of the scrotum — tunica dartos — and of the 

 nipple, the smooth muscle cells are arranged in a network parallel to 

 the surface. In the face and neck striated muscle fibres penetrate 

 the corium. 



"■ eneath the corium is the subcutaneous tissue. ^^ '"; consists of 



