108 



THE HUMAN MECHANISM 



portion differs from the pyloric portion in having greater di- 

 ameter and thinner walls. The entire inner surface is lined by 

 the mucous membrane some three or more millimeters in thick- 

 ness, crowded with comparatively simple glands which pour 

 their secretion, the gastric juice, into the stomach very much as 

 sweat glands discharge perspiration on the skin (see Fig. 55). 



CEsophagus IT- 



Cardiac \ 

 Muscle 

 Gall_ 

 Bladder 



Bile Duct 



Intestine 



From the Liver 

 \ \ Pylorus 



'Pancreatic Duct 



FIG. 54. Stomach, beginning of small intestine, and entrance of bile and 

 pancreatic ducts 



During digestion the bile flows directly from the liver into the intestine ; at other 



times the opening of the bile duct is closed and the bile passes into the gall 



bladder, where it is stored 



The glandular membrane is one of the two principal 

 components of the stomach wall ; the other is the muscular 

 or contractile tissue, which forms a second coat outside the 

 other, arid closely united to it by connective tissue con- 

 taining the larger blood vessels, lymphatics, nerves, etc. 1 

 The muscular coat is comparatively thin in the cardiac region 



1 Fig. 63 (large intestine) shows in cross section somewhat the same 

 arrangement of mucous and muscular coats as in the wall of the stomach. 



