134 



DIGESTION. 



Fig. 27. 



turns upon itself in a loop at the extremity of the projection, and 

 communicates freely with adjacent vessels. The gastric follicles are 



very different in different 

 parts of the stomach. In the 

 pyloric portion (Fig. 27), they 

 are nearly straight, simple 

 tubules, ? J.tf of an inch in 

 diameter, easily separated 

 from each other, lined with 

 glandular epithelium, and ter- 

 minating in blind extremities 

 at the under surface of the 

 mucous membrane. They are 

 sometimes slightly branched, 

 or provided with one or two 

 rounded diverticula, a short 

 distance above their termina- 

 tion. They open on the free 

 surface of the mucous mem- 

 brane, in the interspaces be- 

 tween the projecting folds or villi. Among these tubular glandules 

 there is also found, in the gastric mucous membrane, another kind 

 of glandular organ, consisting of closed follicles, similar to the soli- 



Fig. 28. 



M U C 17 3 M E M B K A N K O F P I G ' S S T O M A C H , from 



Pyloric portion; vertical section; showing gastric 

 tubules, and, at a, a closed follicle. Magnified 70 

 diameters. 



Fig. 28. GASTRIC TUBULES FROM PIG'S STOMACH, Pyloric portion, showing their Caecal 

 Extremities. At a, the torn extremity of a tubule, showing its cavity. 



Fig. 29. GASTRIC TUB ULES FROM PIG'S STOMACH; Cardiac portion. At a, a large tubule 

 dividing into two small ones. b. Portion of a tubule, seen endwise, c. Its central cavity. 



