The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 110.—The Cceliac Axis and its Branches, the Stomach having been raised, and theTransverse Mesocolon Removed.—Gray. same principle in mechanics to them also. For example,the small intestines are supplied by the superior mesentericartery (Pig. Ill), which functions as the feeder to these por-tions, the vessel giving off lateral branches to feed the vari-ous portions, the vessels being given off at regular intervals, 276 ARTERIAL TO SMALL INTESTINES. commencing with the duodenum. The transverse a
The laws and mechanics of circulation, with the principle involved in animal movement . Pig. 110.—The Cceliac Axis and its Branches, the Stomach having been raised, and theTransverse Mesocolon Removed.—Gray. same principle in mechanics to them also. For example,the small intestines are supplied by the superior mesentericartery (Pig. Ill), which functions as the feeder to these por-tions, the vessel giving off lateral branches to feed the vari-ous portions, the vessels being given off at regular intervals, 276 ARTERIAL TO SMALL INTESTINES. commencing with the duodenum. The transverse and ascend-ing portions of the colon and ccecum are supplied by thecolica media (11), colica dextra (14), and ilio-colica (15), givenoff from the opposite side of the vessel; while the descendingcolon and rectum are supplied by the inferior mesentericartery (Fig. 112, 9), the superior hemorrhoidal (13) descendingas low as the middle of the sacrum, where it divides into two. Fig. 111.—Course and Distribution of the Superior Mesenteric Artery.—Wilson and Bu-chanan. 1, Descending portion of the duodenum; 2, transverse portion; 3, pancreas;4, jejunum; 5, ileum ; 6, caecum and appendix vermiformis; 7, ascending colon ; 8,transverse colon ; 9, descending colon ; 10, superior mesenteric artery ; 11, colicamedia ; 19, the branch which inosculates with the colica sinistra ; 13, pancreatico-duodenalis inferior ; 14, colica dextra ; 15, ileo-colica ; 16, 16, vasa intestini tenuis. branches, which continue along the sides of the rectum, divid-ing up into still smaller branches, to be distributed between themucous membrane and the muscles, nearly to the anus, anas-tomosing with the middle and inferior hemorrhoidal branchesof the internal iliac and internal pudic arteries. By means ofthis arrangement, then, together with the local ganglia andnerves for operating them, the vessels are readily expandedand contracted for regulating the blood-supply. One other ARTERIA
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