SUPERIOR MESENTERIC ARTERY. 



315 



a. The infcrwr paitcreatiahduodeiial artery (6) is small, and Pancreatico- 

 usually arises in common with the first intestinal branch. It is dl] 

 directed to the right between the pancreas and duodenum, to both 

 of which it supplies branches, and anastomoses with the superior 

 pancreatico- duodenal artery from the hepatic. 



//. The intestinal branches for the jejunum and ileum (/) are twelve Branches to 

 or more in number, and pass from the left side of the artery between JjJJ : U1 



FIG. 116. SUPERIOR MESENTERIC ARTERY AND ITS BRANCHES (TIEBEMANN). 



<'. Superior mesenteric. e. Ileo-colic. 



b. Inferior pancreatico-duodenal. /. Intestinal branches to the jeju- 



>. Middle colic. num and ileum. 



(/. Right colic. 



the layers of the mesentery. About two inches from their origin branches 



the branches bifurcate, and the resulting pieces unite with similar form arches; 



offsets from the collateral arteries, so as to form a series of arches. 



From the convexity of the arches other branches take origin, which 



divide and unite as before. This process is repeated three or four 



times between the origin and the distribution, but at each branching 



the size of the vessels diminishes. From the last set of arches twigs distribution 



are sent to the intestine on both aspects of the tube, and anastomose on the *"* 



round it. 



