PERIPHERAL NERVE TERMINATIONS. 



365 



Connective-tissue 

 capsule. 



finer non-medullated system of branches appear 

 which innervate the epithelium and terminate in 

 varicosities, discs, or minute granules that lie in appo- 

 sition to epithelial 

 cells. Similar free 

 terminations occur 

 in tendons, and liga- 

 ments, and other 



fibrOUS Connective Fig. 257. Tactile cells from the bill of a 



duck. 



tissue. 



2. Tactile Cells. These are also called Grandry's 

 corpuscles, and may be found in the duck's bill 



just beneath the 

 gum epithelium. 

 The cells are of 

 epithelial origin, 

 oval, and meas- 

 ure about 50 ft in 

 diameter. One 



A^ylinderlncot*. tO fiVC Cells are 



cubic ceiis of core. surrounded by a 



Termination of medu> 

 lary sheath. CO Utt 6 C tlVC-tlS- 



sue capsule. 

 These cells are 

 superposed on 

 each other, with 

 their long axes 

 always parallel 

 to the surface of 

 the bill. A me- 



dullated nerve fiber may be traced to the cap- 

 sule, which it penetrates and then becomes non- 



Nucleus of lamellae. 



End<ell of core. 



... Medullary sheath of 



I ary she 



f '. 



Fig. 258. Corpuscle of Herbst from bill of 

 duck (Bohm and Davidoff). 



