480 ABDOMEN 



1. Inferior pancreatico-duodenal. 



2. Intestinal. To the jejunum and ileum. 



3. Ileo-colic. ^ 



Right colic. To the large intestine. 



Middle colic. J 



Arteria Pancreatico-duodenalis Inferior. The inferior 

 pancreatico-duodenal branch takes origin from the upper 

 part of the superior mesenteric artery, or from its first 

 intestinal branch, and passes upwards and to the right 

 behind the head of the pancreas. It gives branches both 

 to the duodenum and the pancreas and anastomoses with 

 the superior pancreatico-duodenal artery. 



The Arterise Intestinales, jejunales et ilese (Intestinal 

 Arteries) spring from the convexity or left side of the superior 

 mesenteric, and proceed obliquely downwards and to the left, 

 between the layers of the mesentery, to supply the jejunum 

 and ileum. They are very numerous, from twelve to fifteen, 

 or even more, in number, and, by their mutual inoscula- 

 tions, they form a very remarkable succession of arches before 

 they finally reach the bowel. At first they run parallel to one 

 another, but soon each divides into two branches, which join 

 the immediately adjacent branches of the neighbouring stems, 

 and in this way a series of arterial arcades is formed. From 

 these smaller vessels proceed, which divide and unite in a 

 similar manner to form a second series of arches, and so 

 on, until three, four, or perhaps even five tiers of arterial 

 arcades are produced. From the most peripheral arches a 

 multitude of small branches pass directly to the wall of the 

 intestine. Here, along the line of mesenteric attachment, 

 they divide, and the minute twigs thus derived pass trans- 

 versely round the gut so as to encircle it. At first they lie 

 subjacent to the peritoneal coat, but soon they seek a deeper 

 plane in the wall of the intestine, and ultimately reach the 

 submucous coat. 



The Arteria Ileo-colica springs from the middle of the 

 concavity of the superior mesenteric, and proceeds down- 

 wards and laterally towards the right iliac fossa. It is placed 

 behind the parietal peritoneum, and divides into an ascending 

 and a descending or ileo-caecal branch. The ascending branch 

 turns upwards, inosculates with a branch of the right colic, 

 and from the arterial arch thus formed branches are given to 

 the ascending colon. The descending branch, sometimes called 

 the tleo-ccecal artery, proceeds to the upper part of the ileo- 



