CHAP. Ill 



THE SENSE OF TASTE 



127 



I. The organs of taste are principally located in the depth of 

 the stratified epithelium of certain parts of the dorsum and sides 

 of the tongue the organ which comes into immediate contact 

 with the food, owing to the part it plays in the mastication of 

 solids and deglutition of fluids. 



1. Papillary surface of the tongue, with the fauces and tonsils. (Sappey.) 1, Circumvallate 

 papillae ; 2, foramen caecum ; 3, fungiform papillae ; 4, filiform and conical papillae ; 5, trans- 

 verse and oblique sulci ; 6, mucous glands and lymphatic follicles at base of tongue and on 

 fauces ; 7, tonsils ; 8, tip of epiglottis ; 9, fraenum epiglottidis. 



The anterior two-thirds of the tongue (Fig. 51) are covered on 

 the dorsal surface, tip, and edges with a mucous membrane 

 richly supplied with papillae visible to the unaided eye. The 

 circumvallate papillae, 7-12 in number, can be distinguished at 

 the border between the two anterior thirds and the posterior 

 third of the tongue, and form the lingual V : the fungiform 



