MOVEMENTS OF THE ALIMENTARY CANAL. 



715 



esophagus to the incisura, and it may be subdivided further into 

 the cardiac part, lying round the opening of the esophagus, and 

 the intermediate part, between the cardiac region and the in- 

 cisura. The fundic and pyloric parts differ in the structure of the 

 mucous membrane, in the character of the muscular coat, that of 

 the pylorus being stronger, and in the character of their physio- 

 logical activity during digestion. 



In the upright position and filled with food the stomach, 

 .according to the description of the roentgenologists,* occupies 



Pi/loric/Dartofsto 



or antrum pylori /" ^ jjl 



Positioi? of ^ 

 transi/erJe iand 



Fundua 



P^h 



/nterfnediate porti 



Anlrum pijlopl 



B 



Fig. 283. — A, The shape and parts of the stomach as usually represented: I. A., the 

 incisura angularis. B, The shape and position of the stomach in the upright position as shown 

 by the x-ray: I. A., the incisura angularis; I. C, the incisura cardiaca; B. D., the duodenal bulb. 



a more vertical position and has a tubular shape, as represented 

 in Fig. 283, B and Fig. 283a, the lower pole lying in the region 

 of the umbilicus. The esophagus enters the stomach at an angle, 

 and the pyloric part makes quite a sharp angle with the fundus 

 at the incisura, giving what is called the fish-hook shape. At the 

 cardiac pole of the stomach there is usually a collection of gas, 



* Carman, "The Roentgen Diagnosis of Diseases of the Alimentary 

 Canal," 2d ed., 1920, and Hurst, "Constipation and Allied Intestinal Dis- 

 orders," London, 1919. 



