400 



MANUAL OF HISTOLOGY. 



sue. Its component nerves are less flattened, but are likewise 

 provided with ganglia containing variously shaped ganglion- 

 cells. This plexus also gives origin to the secondary networks 

 of the muscularis mucosse, and is besides connected by certain 

 branches with Auerbach' s plexus. 



THE LARGE INTESTINE. 



The histological structure of the colon, broadly speaking, 

 very nearly resembles that of the preceding section of the ali- 

 mentary canal. The lining epithelium of the mucous mem- 

 brane presents the same characteristic appearances as in the 



PIG. 172. Section of the largre intestine of a rabbit: J", crypts of Lleberkiihn : a, epithelium ; &, mu- 

 cosa ; m, muscularis mucosae ; *, submucosa : R, circular muscular layer ; , longitudinal muscular layer ; 

 p, peritoneum. Verson. 



small intestine. The mucosa of the colon is, however, devoid 

 of villi ; but it shows numerous crescentic folds. The muscu- 

 laris mucosse will be found to answer to the description already 

 given of that layer in the small intestine. 



The submucosa also shows the same morphological compo- 

 sition, but appears to be much richer in deposits of fat-cells. 

 Aggregations of lymph-follicles are not generally found, but 

 large, conspicuous solitary glands abound throughout. 



The crypts of Lieberkiihn are identical with the glands of 



