THE SENSES OF PRESSURE OR TOUCH 



737 



points, but experimentation has shown that these points are not 

 evenly distributed throughout the skin, but are more numerous and 



A n — B 



Fig. 365. Fig. 366. 



Fig. 365. — Corpuscles of Grandey feom the Duck's Tongue. (Izquierdo.) 



A, compound of three cells, with two interposed discs, into which the axis-cylinder 

 of the nerve, n, is observed to pass; in B there is but one tactile disc enclosed between 

 two tactile cells. 



Fig. 366. — Grandry Corpuscle in Transverse Section. {After Dogiel.) 



more sensitive in some regions of the integument than in others. 



Fig. 367. — Sensory Nerve Terminating in Arborizations Around the Ends of Mus- 

 cle-fibers. (Ceccherelli.) 



Their total number has been estimated at 500,000, excluding the 

 region of the head. Upon the back of the leg, 1.0 sq. cm. of the skin 



47 



