THE STOMACH. 



127 



FIG. 54. 



what bent and coiled. The ducts of these glands are short, 

 and lined with a continuation of the surface columnar 

 epithelium ; the secreting portions of the tubules join the 

 ducts at the necks of the glands. Besides occasional goblet- 

 cells, the fundus or secretory part of the peptic glands 

 is lined with glandular epithelium of two kinds, central or 

 chief cells, and parietal cells. The 

 central or chief cells are rather pale, 

 faintly granular, columnar cells, 

 which form a complete lining to 

 the lumen of the glands ; they are 

 supposed to secrete- pepsin. Be- 

 tween them and the basement- 

 membrane, and often causing slight 

 bulging of tire latter, are scattered 

 numerous larger oval prominent 

 cells, the parietal cells, supposed 

 to be connected with the secretion 

 of hydrochloric acid ; they do not 

 form a complete layer, not coming 

 into contact with one another, and 

 do not usually abut on the lumen. 

 Differences in the appearance of 

 the cells when charged with secre- 

 tion and when exhausted after di- 

 gestion occur, analogous to the 

 similar changes in other serous 

 glands. 



The pyloric glands (Fig. 54) oc- 

 cupy the pyloric end of the stom- 

 ach. They are compound tubular 

 glands, and are similar to the pep- 

 tic glands, but have longer and 

 wider ducts and shorter secreting 

 portions, their lumen is opener 

 and greater in diameter, they are 

 more branched (more compound), 



and they contain no parietal cells, being lined with central 

 cells only. 



The subepithelial connective tissue of the gastric mucosa, the 



Pyloric glands (Bohm and David- 

 off). 



