GASTRIC GLANDS 87 



tween the cuboidal cells and not extending outward to the 

 central lumen. They are thought to communicate with the 

 lumen by capillary ducts, which may even penetrate their 

 substance. They are supposed to secrete hydrochloric acid, 



FIG. 38. Section of the pyloric mucous membrane. (Landois.) 



and are called acid cells from this fact, or parietal cells 

 from their position. (See Fig. 37.) 

 Method of Secretion, When food is ingested gastric 



