MUCOUS MEMBRANE OF THE ORAL CAVITY. 517 

 Fig. 345. 



A. Secondary papilla of the conical class treated with acetic acid : a, its basement-membrane ; b, 

 its nerve-tube, forming a loop ; c, its curly elastic tissue. The epithelium in this instance is not 

 abundant, but the vertical arrangement of its particles over the apex of the papilla is well seen (d), 

 and illustrates the mode of formation of the hair-like processes described in the text. (Magnified 

 160 diameters.) B. A similar papilla, deprived of its epithelium : a, basement-membrane ; 6, tubular 

 (nerve) fibre, probably forming a loop, but its arch not clearly seen ; c, c, elastic fibrous tissue at its 

 base and in its interior. (Magnified 320 diameters.) c. Nerves of a compound papilla near the point 

 of the tongue, in which their loop-like arrangement is distinctly seen. (Magnified 160 diameters.) 



Fig. 346. 



A Fungiform papilla, showing the secondary papillae on its surface, and at a, its epithelium cover- 

 ing them over. (Magnified 35 diameters.) B. The capillary loops of the simple papillae of A, injected: 

 a, artery ; v, vein. The groove around the base of some of the fungiform papillae is here represented, 

 as well as the capillary loops (c, c) of some neighboring simple papillae. (Magnified 18 diameters.) 



broad, closely surrounding the papilla, especially at its base. They 

 are arranged so as to correspond to the letter V, the point being 



