200 ELEMENTS OF HISTOLOGY. [Chap. xxiv. 



duct takes up two or three tubes by their short, 

 narrow, thin neck. The main part of each gland tube 

 is convoluted and slightly branched. The neck is lined 

 with a layer of polyhedral cells, whereas the gland 

 tube has a lining of columnar transparent cells, and 

 its lumen is very conspicuous. 



During exhaustion these cells are smaller and less 

 transparent than during secretion. Their protoplasm 

 in the former state is a denser reticulum than in the 

 latter, the transparent interstitial substance in the 

 meshes of the cell reticulum being increased in amount 

 during secretion. 



The cells are serous, not mucous, and the se- 

 cretion of the glands cannot therefore be mucous. 

 According to Ebstein the secretion is pepsin, and 

 so he and Heidenhain consider the pyloric glands 

 as simple peptic glands. But this view is not generally 

 accepted. 



Between the mucous membrane with peptic 

 glands and the pyloric end of the stomach with 

 pyloric glands there is a narrow intermediary zone, 

 in which the peptic glands appear by degrees to 

 merge into the pyloric glands. That is, the short duct 

 of the former gradually elongates, the gland tubes 

 get shorter in proportion and convoluted, their 

 lumen gradually enlarges, and the parietal cells 

 become fewer and ultimately disappear. 



268. The mucosa contains isolated lymph follicles, 

 glandulse lenticulares, and in the pyloric part also 

 groups of these glandulse agminatse. 



The submucosa is of very loose texture, and enables 

 the mucosa to become easily folded in all directions. 



The muscular coat is very thick, and consists of 

 an outer longitudinal and an inner thicker circular 

 stratum of non-striped muscular tissue. Numerous 

 oblique bundles are found in the inner section of the 

 circular stratum. 



