720 



CUTANEOUS SENSATIONS 



[CH. LII. 



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

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



clitoris, in the skin, in the lips, in 

 the epineurium of nerve-trunks, 

 and in tendon ; each is about -g^o- 

 inch in diameter, oval or spheroidal, 



FIG. 518. 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 terminates the axis-cylinder 

 of the nerve-fibre, the ending of 

 which is somewhat clubbed (fig. 

 520). 



Touch-corpuscles (Meissner's 

 corpuscles), (figs. 521, 523), are 

 found in the papillae of the skin of the fingers and toes. They are 

 small oblong masses, about zwo i ncn l n g> an( i iro i ncn broad, com- 

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

 of more or less numerous nucleated cells. They do not occur 

 in all the papillae of the parts where they are found, and, as 



FIG. 517. 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 clearcentral core. A hook-shaped 

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

 blood-vessel (V) enters the Pacinian corpuscle, 

 and approaches the end ; it possesses a sheath 

 which is the continuation of the peripheral 

 capsules of the Pacinian corpuscle. xlOO. 

 (Klein and Noble Smith.) 



