462 



THE ARTERIES OF THE ABDOMEN. 



splenic vein. Emerging below the pancreas, it crosses the third part of the duode- 

 num, and descends between the layers of the mesentery. Much diminished in size 

 owing to the large number of its branches, it inclines below towards the right iliac 

 fossa, and ends near the junction of the ileum with the large intestine by inosculat- 

 ing with its own ileo-colic branch. 



Branches. (a) The inferior pancreatico-duodenal, generally arising from the first 

 intestinal branch and directed transversely to the right behind the main trunk, runs 



Fig. 374. THE SUPERIOR MESENTERIC ARTERY AND ITS BRANCHES. (Tiedemann.) \ 



The transverse colon is turned upwards, the jejunum and ileum are drawn to the left, and the 

 posterior layer of the transverse mesocolon and the anterior layer of the mesentery are removed : a, 

 second part of the duodenum ; 6, third part ; c, commencement of the jejunum ; c', c', jejunum and 

 ileum ; d, termination of the ileum in the large intestine ; e, csecum ; /, vermiform appendix ; g, 

 ascending colon ; A, transverse colon ; i, descending colon ; k, pancreas ; 1, trunk of the superior 

 mesenteric artery ; 1', its termination where it inosculates with a branch of the ileo-colic artery ; 2, 2, 

 intestinal branches ; 2', 2', their loops in the mesentery ; 3, inferior pancreatico-duodenal branch, 

 passing to the right to unite with 3', the branch from the gastro-duodenal ; 4, middle colic branch ; 



5, its left branch, passing at 5', to unite with a branch of the left colic of the inferior mesenteric ; 



6, its right branch ; 7, right colic and ileo-colic arteries in one trunk ; 8, right colic, uniting by a loop 

 with the middle colic ; 9, ileo-colic, uniting with the end of the superior mesenteric artery. 



along the concave border of the duodenum, and joins with the superior pancreatico- 

 duodenal artery. 



(b) The intestinal branches, supplying the jejunum and ileum, spring from the 



