STRUCTURE OF THE STOMACH. 



525 



tioned secrete mucus alone. The pepsin is, therefore, afforded only 

 by the cardiac and middle zone of the stomach, and not by the 

 pyloric. 



Fig. 352. 



A and c. Peptic gastric glands, from the middle of the stomach. B. Mucous gland from pyloric 

 region, a, trunk of the glands ; 6, branches ; c, terminal cseca ; d, termination of mucous gland, B, 

 lined with conoidal epithelium. D. Portion of cseca of c, magnified 350 diameters. E. The same, 

 transverse section, , basement membrane ; b, large cells ; c, small epithelial cells. A and B, from 

 the dog 200 diameters ; c, 60 diameters. (Ki'lliker.) 



The bloodvessels of the gastric mucous membrane are very 

 numerous, and their distribution quite characteristic. Fig. 353 

 represents those of the large intestine, which are very similar. 

 The arteries, beginning to divide in the submucous areolar tissue, 

 break up into capillaries of goW to 4^u f an inch, which ascend 

 between, and form a network around the tubular glands, extending 

 as far as their apertures, and forming polygonal meshes around the 

 latter g o to 3^ of an inch in diameter. From this network the 

 veins rise by many radicles, and penetrating the glandular layer 

 further apart than the arteries, enter a venous network with partly 

 horizontal vessels, in the submucous tissue. 



