BLOODVESSELS OF THE LINGUAL MUCOUS MEMBRANE. 589 



capillary loops in the posterior parts of the mouth, and in the 

 parts extending beyond to the entrance of the stomach. 



Mucous MEMBRANE OF THE TONGUE. 



The branches of the lingual artery, of which the dorsalis 

 linguae is distributed to the upper surface, and the arteria ranina 

 to the middle and anterior portion of the tongue, run obliquely 

 upwards and forwards into its substance, giving off numerous 

 branches in their course, and ultimately, in order to reach the 

 mucous membrane, penetrate the compact layer of connective 

 tissue (fascia linguae), which invests the muscular mass. On 

 reaching the mucous membrane, these branches break up into 

 a number of terminal twigs, which then pursue a superficial 

 course, and finally form loops in the papillae. 



The simple filiform papillae of the smallest size contain only 



Fig. 113. 



Fig. 113. Filiform papillae of the tongue. 



a single vascular loop ; but all the compound varieties, whether 

 filiform, fungiform, or circumvallate, possess a system of vessels 

 from which a loop is given off to each secondary papilla. 

 Into every papilla two or more terminal arterial branches 

 enter (fig. 113), divide in the interior, and then, after anas- 

 tomosing once or twice, give off a capillary branch into each 



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