THE TONGUE 267 



The Conical or Filiform Papillae. These papillae consist of flat- 

 tened and elongated epithelial cells which are often so arranged 

 as to produce a slender conical projection or epithelial tuft of 



FIG. 224. FILIFOBM PAPILLAE OF THE DOG'S TONGUE. 



a, papillae ; b, corium ; c, insertion of the muscular fibres into the border of the corium. 

 Hematein and eosin. Photo, x 60. 



variable height, which covers the apex of each connective tissue 

 papilla. This type is the most abundant of the three varieties of 

 lingual papillae ; they are found upon all portions of the dorsum 

 of the tongue. 



The fungiform papillae are formed by a large connective tissue 

 papilla or core which projects above the general level of the 

 epithelial surface and is covered by a smooth layer of stratified 

 epithelium in which occasional taste buds are found. This variety, 

 though much less abundant than the former, is still very numerous 

 and may be found upon any or all portions of the dorsum of 

 the tongue, where they are irregularly scattered among the fili- 

 form papillae. The fungiform variety are most abundant near the 

 margin of the tongue on its dorsal surface. 



The circmnvallate papillae form a group of from eight to twelve 

 elevations which are situated at the base of the tongue, and are 



