ABDOMEN AND PELVIS 



487 



(c) Submucous coat (tela submucosa). 



(d) Mucous coat (tunica mucosa). 



(da) Muscular layer of mucosa (lamina muscularis mucosae). 



(db) Solitary lymph-nodules (noduli lymphatici solitarii). 



(dc) Intestinal glands of Lieberkuehn (Gl. intestinales [Lieber- 



kuehni] ) . 



What are the semilunar folds (plicae semilunares coli) ? 



FIG. 256. 

 Taenia libera 



Taenia mesocolica 



Mesocolon 



Plicae semilunares coli 



A piece of the large intestine, intestinum crassum, partly opened along the line of attachment of 

 the mesocolon. The bowel is in a state of contraction. (After Toldt, Anat. Atlas, Wien, 1900, 2 Aufl., 

 p. 427, Fig. 704.) 



Note carefully the differences between the mucous membrane 

 of the large and small intestines and tabulate these in your 

 drawing-book. 



Open the anterior and right wall of the caecum and study the 

 valve of the colon (valvula coli) (0. T. ileocaecal valve). (See 



