HISTOLOGY 



III 



epithelium, the superficial layers of which are cornitied. Except for a small 

 proximal part, the dorsal surface is covered by small elevations, the papillae 

 (Fig. 49). Morphologically three kinds of papillae can be distinguished. 

 The filiform papillae are the most numerous, the fungiform papillae being 



Fungiform papilla 



Filiform papilla 



Taste bud 



Stratified souamous 

 epithelium 



Lamina propria 



Striated muscle 



Fig. 4q. — Tongue with papillae and taste bud. (X400.) 



present in much smaller numbers. A single circumvallate papilla is situated 

 on the midline close to the base of the tongue. The cone-shaped filiform 

 papillae are formed entirely of epithelial cells. The parts projecting above 

 the surface are composed of overlapping cornified cells. The fungiform 

 papillae are elevated only slightly above the surface (Fig. 49). The epithe- 

 lium as well as the underlying lamina propria takes part in their formation. 

 The free surface is covered by three to four rows of epithelial cells. At 

 its center, each papilla has a single taste bud (75). The circumvallate 

 papilla is surrounded by a deep circular groove and does not project above 



