2 ? 6 



DIGESTION. 



length, and -^-^ in diameter, packed closely together, with 

 their long axis at right angles to the surface of the mucous 

 membrane on which they open, their blind ends resting 

 on the submucous tissue. (See fig. 69). They are all 

 composed of basement membrane, and lined by epithe- 

 lial cells, but they are not all of exactly similar shape ; 

 for while some are simple straight tubes, open at one 

 end and closed at the other (fig. 69), others present at 

 their deeper extremities a varicose, pouched, or in some 

 cases, even a branched appearance (fig. 70, b and <?). The 

 epithelium lining them is not the same throughout. In 

 Fig. 70.* 

 b c 



the upper third or fourth of their length it is cylindrical 

 and continuous with that which covers the free mucous 

 surface of the rest of the stomach. In their lower part, on 



* Fig. 70. The gastric glands of the 'human stomach (magnified). 

 a, deep part of a pyloric gastric gland (from Kolliker) ; the cylindrical 

 epithelium is traceable to the csecal extremities, b, and c, cardiac 

 gastric glands (from Allen Thompson); b, vertical section of a small 

 portion of the mucous membrane with the glands magnified 30 diameters ; 

 e, deeper portion of one of the glands, magnified 65 diameters, showing 

 a slight division of the tubes, and a sacculated appearance, produced by 

 the large glandular cells within them ; d, cellular elements of the cardiac 

 glands magnified 250 diameters. 



