464 



A MANUAL OF ANATOMY. 



folds of the peritoneum that attaches the alimentary canal 

 to the back of the foetus. From the aorta branches pass 

 to the various parts of the intestinal tube : To the stomach 



passes the gastric ; to the 

 small and large intestine the 

 superior mesenteric ; and to 

 the large intestine the inferior 

 mesenteric. All these arteries 

 run to their distribution be- 

 tween the folds of the peri- 

 toneum which encloses the 

 alimentary canal. 



The growth of the bowel 

 is mostly below the stomach 

 and duodenum, and takes 

 place faster than the growth 

 of the corresponding part of 

 the peritoneum, consequently 

 the small intestine is thrown 

 into numerous folds. 



One of these folds is in the 

 duodenum and another in the 

 large intestine (Diag. 33, b). 

 As development proceeds the 

 A SECOND STAGE IN bend in the large intestine is 

 brought nearer to the duo- 

 length of small intestine, and size and denal curve and the mesentery 

 sSe^^raiducr^ 111 acquires a distinct neck. 



(Diag. 34.) 



There now occurs a most interesting change. This 

 change is the rotation of the intestinal tract below the duo- 

 denum on the superior mesenteric artery as an axis, the 

 large intestine, or the colic part of it, passing from the left 



Diag. 33- 



THE PROCESS OF DEVELOPMENT. (I. 

 S. //.) Increase in size of stomach, 



