GLANDS OF THE STOMACH 



I8 9 



is dense but not abundant. There are marked differences in the anat- 

 omy of the glands in different parts of the stomach, which are ^sup- 

 posed to correspond with differences in the uses of various parts of the 

 mucous membrane. There are, indeed, two distinct varieties of glands ; 

 the peptic glands, which secrete propepsin, and the acid-glands, which 

 are supposed to secrete free hydrochloric acid. The peptic glands are 

 most abundant in the pyloric portion of the stomach and around the 



Fig. 39. Glands of the greater pouch of 

 the stomach (Heidenhain). 



Fig. 40. Pyloric glands (Ebstein). 



cardiac opening. The so-called acid-glands are found throughout the 

 mucous membrane, especially in the greater pouch. The secretion in 

 the pyloric portion of the stomach is not acid at any time, while the 

 secretion in the greater pouch during digestion is always strongly 

 acid. 



The pyloric glands are lined with cells that may be called peptic 

 cells (the "chief cells" of some writers). These are conoidal or cuboidal 

 in form, and relatively clear, especially during the intervals of digestion. 

 Similar cells are found, in connection with the so-called acid-cells 



