338 



THE DIGESTIVE SYSTEM 



adherent to the connective tissue of the mucosa, which invests the 

 rounded hlunt extremity of the muscle cell. Many of these muscle 

 fibers are branched. 



The Mucous Membrane. The mucous membrane of the tongue 



FIG. 318. VIEW OF DORSUM OF TONGUE, SHOWING THE VARIOUS PAPILLAE, THE 



TONSILS AND THE FAUCES. 



1, circumvallate papillae; 2, foramen cecum; 3, fungiform papillae; 4, filiform 

 papillae; 5, transverse and oblique rugae; 6, mucous glands; 7, tonsils; 8, tip' of 

 epiglottis; 9, median glosso-epiglottidean fold; /, foliate papilla; L, lenticular papil- 

 lae. (After Sappey.) 



consists of a thick cerium, and an epithelial covering. The deeper 

 part of the CORIUM, consisting- of loose areolar tissue, is intimately 

 connected with the muscle. The superficial portion of the corium, 

 containing denser areolar tissue, carries upon its surface dorsally con- 

 nective tissue papilla! of unusually large size which project into the 



