STRUCTURE OF THE LARGE INTESTINE. 



227 



out ducts, and their secretion finds an exit in the same manner. 

 In typhoid fever they become inflamed and often undergo ulcera- 

 tion. 



Structure of the I^arge Intestine. The coats of this 

 portion of the alimentary canal are the same in number and kind 

 as those of the small intestine, although the arrangement of the 

 longitudinal fibers of the muscular coat is in some portions in the 



Intestinal epithe- 

 lium. 



~ Lumen of gland. 

 Goblet-cell. 



Mucosa. 



Mucosa. 



Muscularis 



mucosse. 



FIG. 122. From colon of man, showing glands of Lieberkiihn ; X 200 (Bohm and 



Davidoff). 



form of bands, a quite different arrangement from that in the 

 small intestine. At the anus the circular fibers constitute the 

 internal sphincter. 



The mucous membrane contains both solitary glands (Fig. 

 117) and glands which resemble the follicles of Lieberkiihn, and 

 indeed are called by that name by some writers (Fig. 122); still 

 the secretion differs very materially, not containing any enzymes 



