138 



THE MUCOUS MEMBRANE. 



terminations, dilated into small pouches,, 

 having a clustered appearance. These are 

 supposed to secrete the gastric fluid. 



In the duodenum is another set of glands 

 called, after their discoverer, Brunner's 

 Glands. (Fig. 24.) 



FlG - 24 - They are small, granular, 



and flattened, and compared 

 to the pancreas and salivary 

 glands; each granule consist- 

 ing of minute lohules or cells, 

 all of which open upon the 

 surface by a common duct. In 

 the lower part of the ileum 

 are the glandulae agminata3,or 

 Peyer's glands. (Fig. 25.) They 

 are found most abundant 

 about the junction of the ile- 

 um with the colon, and op- 

 posite the attachment of 

 the mesentery. They are 

 Collected in numerous 

 small circular patches, sur- 

 rounded by the simple fol- 

 licles. Each is simply a 

 closed sac, having no ex- 

 cretory duct, as far as ob- 

 servation has gone, and, 

 when ruptured, is found to 

 contain mucus and small 

 cells. Their use is not known. It is thought by some 

 that ulceration of Peyer's glands constitutes the essential 



FIG. 23 represents a portion of the mucous membrane of the stomach, show- 

 ing the pits upon its surface, and where the tubes from the gastric glands enter. 



FIG. 24 represents a portion of one of Brunner's glands from the human 

 duodenum magnified 65 diameters. 



FIG. 25 represents a portion of one of the patches of Peyer's glands at the 

 termination of the ileum. 



