PAP1LLJE OF THE TONGUE. 



701 



commonly buried beneatli tlie epithelium ; hence they had 

 "been previously overlooked. 



Circumvallate or Calyciform 'Papilla. These papilla? (fig. 

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

 lines at the base of the tongue (l, I, fig. 202). They are 



circular elevations from 

 to -p^-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 papilla) 

 (fig. 203). 



Fungiform Papilla. The 

 fungiform papillae (fig. 204) 

 are scattered chiefly over the 

 sides and tip, and sparingly 

 over the middle of the dor- 

 sum, of the tongue ; their 

 name is derived from their 

 being usually narrower at 

 their base than at their sum- 

 mit. They also consist of groups of simple papilla), each 

 of which contains in its interior a loop of capillary blood- 

 vessels, and a nerve-fibre. 



Conical or Filiform Papilla. These, which are the most 

 abundant papilla?, are scattered over the whole surface of 

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



* Fig. 204. 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* ; 

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

 injected ; a, artery : r, vein ; c, capillary loops of simple papillae in 

 the neighbouring structure of the tongue ; d, capillary loops of the 

 secondary papillie ; c' } epithelium. 



