516 



THE TISSUE3. 

 Fig. 344. 



A. Vertical section near the middle of the dorsal surface of the tongae : a, a, fungiform papillae ; 

 b, filiform papillae, with their hair-like processes ; c, similar ones, deprived of their epithelium. 

 (Magnified 2 diameters). B. Filiform papillae : a, artery ; -, vein ; c, capillary loops of the secondary 

 papillae ; 6, line of basement-membrane ; d, secondary papilla, deprived of their (e,e) epithelium; 

 /, hair-like processes like epithelium, capping the simple papillae (magnified 25 diameters) ; g, sepa- 

 rated nucleated particles of epithelium (magnified 300 diameters). 1, 2. Hairs found on the surface 

 of the tongue. 3, 4, 5. Ends of hair-like epithelium process, showing varieties in the imbricated 

 arrangement of the particles, but in all a coalescence of the particles towards the point. 5. Incloses 

 a soft hair. (Magnified 160 diameters.) 



| 



papillae filiformes, except that they are far more numerous. (Fig. 

 346, B.) One or two larger nervous trunks also (3 oV^ to TSO^ f aT1 

 inch) enter every fungiform papilla, besides many minute filaments, 

 which, repeatedly anastomosing, spread out like a brush towards 

 the secondary papillas and their axile corpuscles. They probably 

 terminate both in loops and in free extremities. (Kolliker.) 



3. The papillae circumvallatce are situated at the base of the tongue, 

 are six to twelve in number, and consist of a central round papilla, 

 flattened at the end, ^ to J 2 of an inch in diameter, and J g to even 



of an inch high ; with a lower uniform wall, 



to - 3 \ of an inch 



