696 



TOUCH. 



[CH. LI. 



Touch-corpuscles (figs. 518, 520) are found in the papillae 

 of the skin of the fingers and toes. They are small oblong 

 masses, about -^o mcn l n g) an d ^-5 inch broad, composed of 

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

 more or less numerous nucleated cells. Thev do not occur in all 



Fig. $14. Pacinian corpuscle of the cat's mesentery. The stalk consists of a nerve-fibre 

 (N) with its thick outer sheath. The peripheral capsules of the Pacinian corpuscle 

 are continuous with the outer sheath of the stalk. The intermediary part becomes 

 much narrower 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 Pacinian 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.) 



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. 



The peculiar way in which the medullated nerve winds round 

 and round the corpuscle before it enters it is shown in fig. 520. 

 It loses its sheath before it enters into the interior, and then 



