264 THE DIGESTIVE ORGANS. 



C THE STOMACH AND INTESTINE. 



J. GENERAL STRUCTURE OF THE INTESTINAL MUCOUS 

 MEMBRANE. 



The mucous membrane of the stomach and intestine, unlike 

 that of the esophagus and oral cavity, possesses an epithelium of 

 the simple columnar variety with elongated cells (about 22 fj. in 



Alveolus - 

 of gland. 



Mucosa. 



Basal epi- 

 thelial 

 cells. 



,-- Gland- 

 cells. 



- Lumen. 



Branched 



papilla 

 of mu- 

 cosa. 



Fig. 206. Part of section of human esophagus, showing a cardiac gland with a 

 dilated duct; X I2 - 



height). At the cardia the stratified squamous epithelium of the 

 esophagus terminates abruptly, the basilar layer of the esophageal 

 epithelium being continued as the simple columnar epithelium of 

 the stomach. In the intestine the epithelium shows a well-marked 

 striated cuticular border, striated protoplasm in the outer ends of 

 the cells, extending to the immediate vicinity of the nuclei, which 



