BRUIN'S GLANDS. 305 



to the blood, much, in the same manner as is believed to be 

 the case in the so-called vascular glands, such as the spleen, 

 thymus, and others ; and that thus Peyer's glands should 

 also be regarded as closely analogous to these vascular 

 glands. Possibly they may combine the functions both of 

 lymphatic and vascular glands, absorbing and elaborating 

 material both from the chyle and from the blood within 

 their minute vessels, and transmitting part of the lacteal 

 system and part direct to the blood. 



Fig. So.* 



Br unn's glands (fig. 80) are confined to the duodenum ; ! 

 they are most abundant and thickly set at the commence- 

 ment of this portion of the intestine, diminishing gradually 

 as the duodenum advances. Situated beneath the mucous 

 membrane, and imbedded in the sub mucous tissue, they 

 are minutely lobulated bodies, visible to the naked eye, 

 like detached small portions of pancreas, and provided with ? 

 permanent gland-ducts, which pass through the mucous 

 membrane and open on the internal surface of the intestine. 



* Fig. 80. Enlarged view of one of Brann's glands from the human 

 duodenum (from Frey). The main duct is seen superiorly ; its branches 

 are elsewhere hidden by the bunches of opaque glandular vesicles. 



