1576 



HUMAN ANATOMY. 



The tubo-alveolar glands surrounding the circumvallate and the fohate 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. 



Epithe- 

 lium 



Annular wall 



Central 

 portion of pa 

 pilla — con 

 nective tissue 







Serous gland 



Muscular tissue * . *■ * 



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



vicinity. The glands encircling the circumvallate papilLne constitute an annular group 

 some 4 mm. wide and about twice 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 



