THE STRUCTURE OF THE STOMACH. 



17T 



kind. 1 These correspond to the chief cells of the cardiac glands. 

 They are of a columnar or cubical shape, and in the fresh condition 

 of a granular appearance, and quite unlike the columnar epithelium- 

 cells of the surface, which are long tapering cells, the outer part of 

 which is filled with mucus. 



At the pylorus itself the glands become considerably lengthened,, 

 and are continued into the submucous tissue, the muscularis mucosse 

 being here absent ; they thus present transitions to the glands of 

 Brunner, which lie in the submucous tissue of the duodenum, and 

 send their ducts through the mucous membrane to the inner surface. 



FIG. 202, A. PLAN OF THE BLOOD- 

 VESSELS OF THE STOMACH. 

 (Modified from Brinton.) 



, small arteries passing to break up 

 into the fine capillary network, d, 

 between the glands; b, coarser 

 capillary network around the 

 mouths of the glands ; c, c, veins 

 passing vertically downwards from 

 the superficial network ; e, larger 

 vessels in the submucosa. 



FIG. 202, B. LYMPHATICS OF THE HUMAN GASTRIC 



MUCOUS MEMBRANE, INJECTED. (C. Loven.) 



The tubules are only faintly indicated ; a, muscularis 

 rnucosse ; b, plexus of fine vessels at base of glands ; c, 

 plexus of larger valved lymphatics in submucosa. 



The Mood-vessels of the stomach are very numerous, and pass to the 

 organ along its curvatures. The arteries pass through the muscular 

 coat, giving off branches to the capillary network of the muscular 

 tissue, and ramify in the areolar coat. From this, small arteries 

 pierce the muscularis mucosa;, and break up into capillaries near the 

 bases of the glands (fig. 202, A). The capillary network extends between 

 the glands to the surface, close to which it terminates in a plexus of 

 relatively large venous capillaries which encircle the mouths of the 

 glands. From this plexus straight venous radicles pass through the 



1 In man it is only quite near the pylorus that the parietal cells are altogether 

 absent. 



