TONGUE. 



179 



parallel folds of mucous membrane, in the epithelium of which there 

 are many taste buds. These structures, which occur also in the lateral walls 

 of the vallate papillae, require a detailed description. 



Taste- buds are round or oval groups of elongated epithelial cells 

 which extend from the inner to the outer epithelial surface; in contact with 

 them the nerves of taste terminate. Their position in the epithelium is 

 shown in Figs. 202 and 203. In the fetus of from 5 to 7 months they are 

 more numerous than in the adult, occurring in many filiform papillae and 



Secondary 



papillae 

 of a fungiform 

 papilla. 



Fungiform 

 papilla. - 



Oblique section 



of a filiform 



papilla. 





Cornified epithelium. 



Secondary 

 papillae. 



of 



Filiform 

 ~~-~ papillae. 



Nerves." 



Vein. 



Artery. " 



Fat. 



Fascia 

 linguae. 



Striated mus- 

 cle fibers. 



FIG. 201. FROM A LONGITUDINAL SECTION OP THE HUMAN TONGUE. 

 i, Epithelium showing postmortem disintegration. 



X 25. 



in all the fungiform, vallate and foliate forms, together with both surfaces 

 of the epiglottis. They are destroyed with an infiltration of leucocytes, 

 except those on the lateral walls of the vallate and foliate papillae, small 

 numbers of those on the anterior and lateral fungiform papillae, and those 

 on the laryngeal surface of the epiglottis. In such places they are found in 

 the adult. 



Each bud consists of two sorts of elongated epithelial cells, among 

 which lymphocytes are frequently seen. Most of the cells are supporting 

 cells. These may be uniform in diameter or tapering toward the ends. 



