CH. LIU.] 



TACTILE END ORGANS 



767 



End-bulbs are found in the conjunctiva (where in man they are 

 ppheroidal, but in most animals oblong), in the glans penis and 



clitoris, in the skin of the lips, in 

 the epineurium of nerve-trunks, 

 and in tendon ; each is about -^^ 

 inch in diameter, oval or spheroidal, 



PIG. 467. Summit of a Pacinian cor- 

 puscle of the human finger showing 

 the endothelial membranes lining the 

 capsules, x 220. (Klein and Noble 

 Smith.) 



and is composed of a medullated 

 nerve - fibre, which terminates 

 among cells of various shapes. Its 

 capsule contains a transparent or 

 striated core, in the centre of 

 which the axis-cylinder terminates 

 (fig. 469). 



Touch-corpuscles (Meissner's 

 corpuscles) (figs. 470, 472), are 

 found in the papillae of the skin 

 of the fingers and toes. They are 

 oblong, about ^^ inch long, and -^y inch broad, and composed 

 of connective tissue, surrounded by elastic fibres and a capsule of 

 nucleated cells. They do not occur in all the papillae of the 

 parts where they are found, and, as a rule, in the papillae in which 

 they are present there are no blood-vessels. 



FIG. 466. Pacinian corpuscle of the cat's mesen- 

 tery. The stalk consists of a nerve-fibre (N) 

 with its thick outer sheath. The peripheral 

 capsules of the Pacinian corpuscle are con- 

 tinuous with the outer sheath of the stalk. 

 The intermediary part becomes much nar- 

 rower near the entrance of the axis-cylinder 

 into the clear central core. A hook-shaped 

 termination (T) is seen in the upper part. A 

 blood-vessel (V) enters the Paciuian corpuscle, 

 and approaches the end ; it possesses a sheath 

 which is the continuation of the peripheral 

 capsules of the Pacinian corpuscle, x 100. 

 (Klein and Noble Smith.) 



