THE SUPESIOE MESENTEEIC ARTEEY. 



Fi.cr. 278. 



429 



Fig. 278. — The Superior Mesenteric Artery and its Branches 

 (from Tiedemann). ^ 



The transverse arch, of the colon is turned upwards ; the transverse meso colon is 

 dissected so as to expose the duodenum and pancreas at its root ; the small intestines are 

 thrown towards the left side ; a, the descending part of the duodenum ; h, the lower 

 part ; c, the commencement of the jejunum ; c', c', the jejunum and ileum ; d, the 

 termination of the ileum in the caput ctecum coli ; e, the ca;cum ; /, the vermiform pro- 

 cess ; (J, the ascending colon ; h, the transverse arch ; i, the descending colon.; Jc, the 

 pancreas ; 1, the trunk of the superior mesenteric artery ; 1', the termination of that 

 vessel where it loops round into a branch of the ileo-colic arteiy ; 2, 2, the intes- 

 tinal branches ; 2', 2', their loops in the mesentery ; 3, inferior jiancreatico-duodenal 

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

 middle colic branch ; 5, its left colic branch passing at 5' to unite with the 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, the ileo- 

 colic, uniting with the end of the superior mesenteric artery. 



(c) The colic branches arise from the right or concave side of the 

 artery, and are usually three in number. 



