450 



THE ALIMENTARY CANAL 



[GIL XXVII. 



coarsely granular polyhedral cells which are continuous with the 

 columnar cells of the duct. Between these cells and the basement 

 membrane of the tubes, are large oval or spherical cells, opaque or 

 granular in appearance, with clear oval nuclei, bulging out the base- 

 ment membrane ; these cells are called parietal cells. They do not 

 form a continuous layer. The body which is broader than the neck, 

 and terminates in a blind extremity or fundus near the muscularis 

 mucosse, is lined by cells continuous with the central cells of the 



FIG. 877. Section showing the 

 pyloric glands, s, free sur- 

 face ; d, ducts of pyloric glands ; 

 n, neck of same ; m, the gland 

 tubules ; mm, muscularis mu- 

 cosse. (Klein and Noble Smith.) 



-a 



FIG. 378. Plan of the blood-vessels of the 

 stomach, as they would be seen in a 

 vertical section, a, arteries, passing 

 up from the vessels of submucous 

 coat ; b, capillaries branching between 

 and around the tubes ; c, superficial 

 plexus of capillaries occupying the 

 ridges of the mucous membrane; 

 d, vein formed by the union of veins 

 which, having collected the blood of 

 the superficial capillary plexus, are 

 seen passing down between the tubes. 

 (Brinton.) 



neck, but longer, more columnar and more transparent. In this 

 part are a few parietal cells of the same kind as in the neck 

 (fig. 375). 



(b) Pyloric Glands. These glands (fig. 377) have much longer 

 ducts than the cardiac glands. Into each duct two or three tubes 

 open by very short and narrow necks, and the body of each tube is 

 branched, wavy, and convoluted. The lumen is large. The ducts are 

 lined with columnar epithelium, and the neck and body with shorter 

 and finely granular cubical cells, which correspond with the central 

 cells of the cardiac glands. As they approach the duodenum the 

 pyloric glands become larger, more convoluted and more deeply 



