Chap. XXIV.] CESOTHAGUS AND STOMACH. 



I 99 



polyhedral, but farther downwsrrds increase to cylin- 

 drical cells, and in the fundus of the gland tube they 

 are long columnar. This layer of cells bordering the 

 lumen is the layer of chief 

 cells (Heideiihain.) Outside 

 them is the limiting mem- 

 brana propria of the gland 

 tube. But from place to 

 place, between the mem- 

 brana propria and the chief 

 cells, are single oval sphe- 

 rical or angular large 

 granular and opaque-look- 

 ing cells, called the parietal 

 cells (Heidenhain). These 

 are more numerous in the 

 neck than in any other 

 part of the gland ; at the 

 fundus they are few and 

 far between, whereas at 

 the neck they form almost 

 a continuous layer. Their 

 protoplasm is densely reti- 

 culated. 



-267. The |ylori< 

 glands (Fig. 115). The 



duct of each pyloric glaild Fig. 115. From a Vertical Section 



is several times longer than 



in the peptic. The duct of 



the former occupies in 



some places as much as 



half of the thickness of the 



mucosa, whereas that of the latter does not exceed 



in the fundus of the stomach or in the cardia, more 



than one-fourth or one-fifth of the thickness. 



The epithelium lining the duct of the pyloric 

 glands is the same as in that of the peptic. Each 



through the Mucous Membrane 

 at the Pyloric End of the 

 Stomach. 



Free surface; a, ducts of pyloric 

 glands ; n, neck of same ; m, the gland 

 alveoli; mm, nniscularis mncosre. 

 (Atlas.) 



