18 



PHYSIOLOGY AND HEALTH, 



CHAPTER III. 



Stomach. Gastric Juice. Processes of Digestion seen by Dr. 

 Beaumont. 



Fia. IV. Stomach. 



a. (Esophagus, 

 opening into tho 

 stomach. 



b. Pyloric ori- 

 fice, opening into 

 the alimentary ca 

 nal. 



r, c. Duodenum, 

 or upper part of 

 the alimentary ca- 

 nal. 



d. Left end or 

 great pouch. 



25. THE stomach(F'ig. IV.) is along, round, and somewhat 

 irregularly-shaped sack. It is placed on the left side of the 

 abdomen, just below and within the lower ribs, and runs 

 crosswise towards the right side, (Fig. V. f.) It has two 

 apertures, one towards the left extremity, (Fig. IV. a,) where 

 the gullet terminates, and the other on the right extremity, 

 (Fig. IV. &,) where the stomach opens into the alimentary 

 canal, (Fig. IV. c, c.) This organ is very expansive, and varies 

 greatly in size, according to the quantity of matter contained 

 in it. It is sometimes so much distended with a large meal, 

 or with liquid or gas, as to hold two quarts or more; at 

 other times it is so contracted as to contain less than a pint. 

 It usually contracts down to its contents, however small ; 

 and is therefore always full, either of solid or fluid matters 

 or of gas. 



