90 



INTRODUCTION TO NEUROLOGY 



cells to form differentiated sense organs. Figure 33 illustrates a sensory end- 

 ing in the mucous membrane of the esophagus, and Fig. 34 types of nerve- 



Fig. 33. Free nerve-endings in the mucous membrane of the esoph- 

 agus of a cat. (After DeWitt, from Wood's Reference Handbook of the 

 Medical Sciences.) 



Fig. 34. Nerve-endings in the mouth epithelium of the frog: A, From 

 sensory papilla of the tongue; B, cylinder cells; C, isolated rod cell; D, upper 

 part of papilla; E, ciliate cells of palate. (After Bethe, from Wood's Refer- 

 ence Handbook of the Medical Sciences.) 



endings upon epithelial cells. The nerve-endings in the visceral muscles 

 are very simple (see Figs. 37 and 38) and the separation of sensory from 

 motor endings here has not been effected. 



