CARDIAC AND PYLORIC STOMACH. 71 



(//) The former layer tapers off suddenly to meet the single 

 row of columnar epithelium on the gastric surface. Recognise 

 the gastric follicles, tubular glands set side by side, the length 

 of which determines the thickness of the membrane. Observe 

 the muscularis mucosse and that the muscular coat is not 

 markedly thickened (Cardiac sphincter?). 



Cardiac end of stomach. V.S. Kitten, (p. & c. the same 

 as the preceding.) The gastric glands not being fully grown 

 are less closely packed and therefore better seen individually 

 than in the adult structure. (L) The mucosa is the thickest 

 of the coats. In it find the follicles divisible into the gland 

 proper, and a short wide duct which presents a wide opening 

 on the surface. The duct is lined by a single layer of 

 columnar cells, the same as that on the inner surface of the 

 organ. The gland tubule presents two kinds of epithelial 

 cells, the inner of which are small and clear and almost fill 

 the cavity and are known as the chief cells. Outside are the 

 parietal cells, oval nucleated masses of protoplasm which cause 

 lateral projections in the outlines of the tubules. In the 

 lower part of the mucosa find cross sections of the glands 

 and note that the parietal cells also project inwards between 

 the chief cells and so establish a connection with the secretory 

 passage. The interstitial material between the glands consists 

 of fine adenoid tissue in which blood-vessels and strands from 

 the subjacent muscularis mucosse should be found. 



Pyloric mucosa. V.S. Kitten, (p. 3, inj., &c., as before.) The 

 secreting portions of the glands are lined by cells similar to the 

 chief cells ; there are no parietal cells. In the sub-mucosa lymph 

 nodules are frequently met with. The main mass of these lies 

 in this layer ; a portion, however, projects into the mucosa in 

 a somewhat diffuse manner. 



