TASTE. 



151 



the dorsum of the tongue, and over its whole surface are numer- 

 ous mucous follicles, whose secretions keep the tongue moist 

 (Fig. 41). 



FIG. 41. 



Upper Surface of the Tongue. 



Describe the filiform papillae of the tongue. 



The filiform papillse, are set mostly upon the middle of the 

 dorsum, but are scattered over the entire surface, and are far more 

 numerous than any other kind. They are conical in shape, and 

 are covered with epithelium, which projects in a brush-like tuft 

 from the apex. Their function is mostly tactile, and in animals, 

 especially of the cat tribe, are very prominent. 



