130 



NORMAL HISTOLOGY. 



continuous with the stratified epithelium covering the gums and 

 lining the buccal cavity. 



FIG. 109. 

 & 





Two circumvallate papillse ; rabbit. (Ranvier.) p, p f , fibrous tissue extending into the papilla ; 

 p', that containing the nerves passing to the taste-buds ; g, taste-buds ; v, small vein ; n, n, 

 nerves ; a, acini of a serous gland. 



The upper surface and the edges of the tongue are covered with 

 papillae, some of which are pointed (filiform papillae), others rounded 



FIG. 110. 



Portion of a section of a mucous gland in the human tongue. (Benda and Guenther's Atlas.) 

 a, duct ; b, acinus opening into a duct-radicle ; c, acinus lined with mucigenous cells, sim- 

 ilar to b. Between and below a and c, cross-section of a small artery, recognizable by the 

 elongated nuclei of its muscular coat. 



(fungiform papillae), and still others surrounded by a sulcus (cir- 

 cumvallate papilla) (Figs. 107-109). Within the epithelium lining 



