HUMAN ANATOMY. 



The tubo-alveolar glands surrounding the circumvallate and the foliate papillae 

 are the only ones of a purely serous type ; their thin, watery secretion is no doubt an 

 important medium in conveying sapid substances to the taste-buds situated in this 



FIG. 1336. 



Epithelium covering 

 filiform papillae 



Capillary loops within 

 connective-tissue basis 

 of papillae 



Mucous membrane 



Muscular tissue 



Injected mucous membrane and subjacent areolar and muscular tissue from upper surface of tongue. X 60. 



FIG. 1337. 



Epjtl 



hum 



",:>;;' o. ;;'' 



Taste-bud Annular wall 



Duct 



of 

 gland 



Central/ -^ ,,. 

 portion r. i pa- > - 



:-' ''''". 

 MO live tissue S VtflKjr~Ii 



''':,- 



erous gland 







<** * 



Section across circumvallate papilla from child's tongue, showing central portion and encircling fold. X 75- 



vicinity. The glands mrirrliruj the circumvallate papillae constitute an annular group 

 some 4 nun. wide and alxmt tuicc as deep. Those about the papillae foliata form an 

 elongated group, about 3.5 mm. in width, which extends from 8-15 mm. in front of 



