DIGESTIVE SYSTEM. 185 



loric; two surfaces, dorsal and ventral; two curva- 

 tures, greater and lesser; and two orifices, esophageal 

 and pyloric. The most fixed point is the esophageal 

 orifice, which is situated opposite the seventh left 

 costal cartilage one inch from the sternal junction. 

 The most movable portion is the pyloric end, which 

 is situated one-half to one and one-half inches to the 

 right of a median plane and a variable distance be- 

 low the esophageal opening. The distance between 



Fig. 134. Anterior outlines of stomach. (His' model.) 



the two orifices is about four inches. The full 

 length of the stomach is about ten inches, and the 

 greatest diameter four inches, with average capacity 

 of one quart. These dimensions are subject to 

 great variations, 



The stomach wall, like that of other parts of the 

 food canal, is made up of four layers : mucosa, submu- 

 cosa, muscularis, and serosa. 



I. Mucosa. The mucous surface is uneven, due 



