CHAP. XV.] COMPOUND PAPILLAE OF THE TONGUE, 



439 



thickness and density F ^ 99 - 



of their epithelium. 

 This, indeed, frequent- 

 ly composes two-thirds 

 of their length, being 

 sent off from the sides 

 and summits of their 

 secondary papillae in 

 long pointed processes, 

 which are immersed 

 in the mucus of the 

 mouth, and may be moved in any direction, though they are gene- 



Fig. 100. 



Various forms of the conical compound papillae, deprived of their 

 epithelium : o, &, and especially c, are the best marked, and were 

 provided with the stiffest and longest epithelium; their simple 

 papillae are more accumulated, d, approaches the fungiform variety ; 

 *>/ come near the sim P le papillae. Magnified 20 diameters. 



Fungiform papillae, 

 their epithelium. 



A. Vertical section near the middle of the dorsal surface of the tongue: 



b. Filiform papillae, with their hair-like processes, c. Similar ones deprived of their epithel 

 Magnified 2 diameters. 



B. Filiform compound papillae: a. Artery, v. Vein. c. Capillary loops of the secondary 

 papillae, b. Line of basement membrane, d. Secondary papillae, deprived of e, e, the epithelium. 

 /. Hair-like processes of epithelium capping the simple papillae. Magnified 25 diameters, g. Sepa- 

 rated particles of epithelium, magnified 300 diameters. 



1,2. Hairs found on the surface of the tongue. 3,4,5. Ends of hair-like epithelial processes, 

 shewing varieties in the imbricated arrangement of the particles, but in all a coalescence of the par- 

 ticles towards the point. 5, encloses a soft hair. Magnified 160 diameters. 



