SKCRKTTON OF CIASTRIC JUICE. 



164. Secretion of Gastric Juice. 



After the discovery of the two kinds of glands in the stomach, and 

 after it was found that the fundus-glands contained two different forms 

 of cells, the question as to whether the different constituents of gastric 

 juice were formed by different histological elements came to be 

 investigated. 



Changes of the Cells during Digestion. During the course of 

 digestion, the cells of the fundus (and pyloric glands, dog) undergo 





Fig. 137. 



Section of the pyloric mucous mem- 

 brane (Ebstein). 



Fig. 138. 



Pyloric glands, showing changes 

 of the cells during digestion 

 (Ebstein). 



important changes (Heidenhain, Ebstein). During hunger, the chief 

 cells are dear and large, the parietal investing cells are small, the 

 pyloric cells dear and of moderate size. During the first six hours of 



