424 Dynamic Theory. 



tains fat. It is the heavy part of the skin, that which becomes leather 

 in the tanning process. The top surface of this la} T er is composed of a 

 vast number of conical protuberances called papillae and tactile corpus- 

 cles. They rest on a bed of fibres which is closely interwoven like felt 



FIG. 166. Section of skin and subcuta- 

 neous tissue magnified 20 diameters. 



.(Kolliker.) 



a. Horny layer ; Epidermis. 



b. Malpigian layer or rete mucosum; 

 the pigment layer. 



c. Cerium or true skin. 



d. Panniculus adiposus ( fat layer.) 



e. Papillfe on the ridges of the cormm. 



/".Fat clusters. 



0, Sweat glands. 



ft. Sweat ducts. 



i. Openings of sweat ducts. 



and of fine texture on the upper 

 side next the papillae, but coarse 

 and loose on the under side. Some 

 of the fibres penetrate below into 

 the fat and cellular tissue. The 

 papillae consist of an artery, a vein 

 and a nerve, and are the termina- 

 tions of the nerve connections be- 

 FIG. 166. tween the skin and the brain. 



The " tactile corpuscles " are formed in certain of the papillae by an 

 enlargement of the nerve into an oval swelling. The papillae thus mod- 

 ified are formed only in the parts having the most delicate sense of 



FIG. 167. Tactile Papilla from the palm 

 of the hand. 

 P.-Papilla. 



C. Touch Corpuscle. 



-Nerve. 



The touch papillae are about 1-100 of an 

 inch high and 1-250 of an inch in diameter. 



FIG. 168. Pacinian Corpuscle. 



. Neurilemma nerve cover. 



6. Nerve fibril. 



c. Capsule. 



d. Peculiar fibres. 



e. Central cylinder. 



(After Ley dig) 



touch, as the ends of the fingers, the hand and tip of the tongue, &c. 

 There is still another class of sensitive bodies attached to some of the skin 

 nerves. These are called Pacinian corpuscles, and are attached to the 

 nerves of the sole of the foot and palm of the hand, and are found spar- 



