THE ALIMENTARY CANAL AND ITS APPENDAGES. 333 



eminences or papilla, such as are found more highly devel- 

 oped on the tongue of a cat, where they may he readily felt. 

 On the human tongue there are three forms of papillae, the 

 circumvallate, i\\Q fungi form, and the filiform. The circum- 

 vallate papillae, 1 and 2, the largest and least numerous, are 

 from seven to twelve in number and lie near the root of the 

 tongue arranged in the form of a V with its open angle turned 



Fm. 111. The upper surface of the tongue with part of the pillars of the fauces 

 and the tonsils. 1, 2, circumvallate papillae ; 3, fungiform papillae ; 4, filiform 

 papillae ; 6, mucous glands ; 7, tonfeils ; 8, tip of epiglottis. 



forwards. Each is an elevation of the mucous membrane, 

 covered by epithelium, and surrounded by a trench. On the 

 sides of these papillae, imbedded in the epithelium, are many 

 small oval bodies richly supplied with nerves and sup- 



