342 



THE DIGESTIVE SYSTEM 



in nijui, but arc well developed in the rabbit and certain other rodents. 

 They contain numerous tasie buds. In the lymphoid area also, at the 

 anterior lateral margins, are a group of low irregularly disposed mucous 

 folds, the so-called lenticular papilla. 



FlG. 322. ClRCUMVALLATE PAPILLAE OF THE HtJMAN TONGUE. 



A, axial section ; B, section through the side of a papilla. The serous glands of von 

 Ebner occupy the lower portion of the figure. Hematein and eosin. Photo. X 40. 



Mucous and SKUOUS GLANDS occur in the deeper portion of the 

 corium of the tongue and among its muscle bundles; they open upon 

 its epithelial surface between the papilla?. These glands are most 

 abundant at the base of the organ but are also found along its margins 

 as far forward as the tip, where a pair of small tubulo-acinar sero- 

 mucous glands lie 011 either side of the median septum and open upon 

 the ventral surface of the tongue. These are the anterior lingual 



