702 



THE SENSE OF TASTE. 



of the epiglottis is, however, free from them. They are 

 commonly buried beneath the epithelium ; hence they had 

 been previously overlooked. 



Circumvallate or Calyciform Papillce. These papillae (fig. 

 196), eight or ten in number, are situate in two Y-shaped 

 lines at the base of the tongue (i, i,fig. 195). They are 



circular elevations from -f^th. 

 to T \th of an inch wide, each 

 with a central depression, and 

 surrounded by a circular fis- 

 sure, at the outside of which 

 again is a slightly elevated 

 ring, both the central elevation 

 and the ring being formed 

 of close set simple papillae, 

 (fig. 196). 



Fung ij "or -m \Papillce. -The fun- 

 giform papilla3 (fig. 197) are 

 scattered chiefly over the si$es 

 and tip, and sparingly over 

 the middle of the dorsum, of 

 the tongue ; their name is de- 

 rived from their being usually 

 narrower at their base than at 

 their summit. They also con- 

 sist of groups of simple papillae, each of which contains in its 

 interior a loop of capillary blood-vessels, and a nerve-fibre. 

 Conical or Filiform Papillce. These, which are the most 

 abundant papillae are scattered over the whole surface of 

 the tongue, but especially over the middle of the dorsum. 



* Fig. 197. Surface and section of the fungiform papillae (from 

 Kolliker, after Todd and Bowman). A, the surface of a fungiform 

 papilla, partially denuded of its epithelium, ^ ; p, secondary papilla ; 

 e, epithelium. B, section of a fungiform papilla with the blood-vessels 

 injected; a, artery; v, vein ; c, capillary loops of simple papillae in the 

 neighbouring structure of the tongue ; d } capillary loops of the secondary 

 papillaB ; e, epithelium. 



