CH. LIIL] 



TACTILE END-OKGANS 



769 



are contained within a delicate nucleated sheath. The nerve enters 

 on one side, and, laying aside its medullary sheath, terminates 

 between the cells in flattened expansions. 



FIG. 471. A corpuscle of 

 Grandry,. from the 

 tongue of a duck. 



FIG. 472. A touch-corpuscle from the skin of the 

 human hand, stained with gold chloride. 



Sensory nerve - endings in muscle. Nerve terminations, 

 sensory in function, are found in tendon. Some of these are end- 

 bulbs, and others appear very much like end-plates, as represented in 

 figs. 471 and 472. The neuro-muscular spindles, one of which is 



FIG. 473. Termination of inedullated 

 nerve-fibres in tendon near the mus- 

 cular insertion. (Golgi.) 



FIG. 474. One of the reticulated end-plates 

 of fig. 473, more highly magnified, a, 

 MeduUated nerve-fibre; b, reticulated 

 end-plate. (Golgi.) 



shown in the accompanying drawing (fig. 475), are principally found 

 in muscles in the neighbourhood of tendons and aponeuroses. 



The principal grounds for believing the neuro-muscular spindles 

 to be sensory are, first, that the nerve-fibres that supply them do 

 not degenerate when the anterior roots of the spinal nerves are cut, 

 and secondly, that they do degenerate when the posterior roots are 

 divided (Sherrington). They also undergo degenerative changes in 



3 c 



