TOUCH-CORPUSCLES ; EXD-BtJLBS. 425 



specially concerned in the sense of touch, yet their absence 

 from the papillae of bther tactile parts shows that they are 

 not essential to this sense. 



Closely allied in structure to the Pacinian corpuscles 

 and touch-corpuscles are some little bodies about -jJ- of 

 an inch in diameter, first particularly described by Krause, 

 and named by him " end-bulbs." They are generally oval j 

 or spheroidal, and composed externally of a coat of con- 

 nective tissue enclosing- a softer matter, in which the ex- 

 tremity of a nerve terminates. These bodies have been 

 found chiefly in the lips, tongue, palate, and the skin of the : 

 glans penis (fig. 1 14). 



Although destined especially for the sense of touch, the 

 papilla are not so placed as to come into direct contact 

 with external objects ; but, like the rest of the surface of 

 the skin, are covered by one or more layers of epithelium, 

 forming the cuticle or epidermis. The papilla) adhere 

 Fig. 114.* B 



* Fig. 114. End-bulbs in papillre (magnified) treated with acetic 

 acid. A, from the lips ; the white loops in one of them are capillaries. 

 B, from the tongue. Two end-bulbs seen in the midst of the simple 

 papillae : a, , nerves (from Kolliker). 



