572 



THE SKIN. 



[CH. XXXVIII. 



looser and more reticnlar in its deeper part, where it passes by 

 insensible degrees into the areolar and adipose tissue of the sub- 

 cutaneous region. The denser superficial layer is very vascular, 

 and is covered with minute papillae; the epidermis is moulded 



~ 



over these, and in the palms 

 and soles, where the papillae 

 are largest and are disposed 

 in rows, their presence is 

 indicated by the well-known 

 ridges on the surface. 



The papilla? contain loops of capil- 

 laries, and in some cases, especially 

 in the palm of the hand and fingers, 

 thev contain tactile corpuscles (which 



-11 -u c 11 j -u j 



*ul be more rully described in connec- 



f: n ,, ...jfVi *}, opt,cp nf tnnpM Snpfial 



T 



sweat-gland. D. Subcutaneous capillary networks are distribiited to 



fat. E. Fundus of hair-follicle, * 



with hair-papilla. (Klein.) the sweat-glands, sebaceous glands, 

 and hair follicles. 



The deeper portions of the dermis in the scrotum, penis and 

 nipple, contain involuntary muscular tissue; there is also a bundle 

 of muscular tissue attached to each hair follicle. 



The Nails are thickenings of the' stratum lucidum. Each 



Fig. 441. Vertical section of skin. 



A: Sebaceous gland opening 



iiito hair follicle. B. Muscu- 

 lar fibres. C. Sudoriferous or 



