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OBSERVATIONS ON THE INFERIOR MESENTERIC ARTERY AND ITS BRANCHES
Author(s): 
Pages: 428-436
Year: Issue:  4
Journal: Acta Anatomica Sinica

Keyword:  肠系膜下动脉乙状结肠动脉左结肠动脉动脉干动脉吻合腹主动脉分叉下乙第三腰椎中国成人外科解剖学;
Abstract: The inferior mesenteric artery and its branches of 125 Chinese adult cadavers havebeen studied. Most of the inferior mesenteric arteries (89.6%) originate at the level ofthe 3rd lumbar vertebra and at the intervertebral disc between the 3rd and 4th lumbarvertebrae. In 86. 4% of the cases, the bifurcation of the abdominal aorta is opposite tothe 4th lumbar vertebra and the intervertebral disc between the 4th and 5th lumbarvertebrae. The variation of the height of origin of the inferior mesenteric artery is incorrelation with that of the aortic bifurcation. All the left colic arteries, except two arising from the superior mesenteric artery,come from the inferior mesenteric artery. The number of the sigmoid artery varies from1--4, among them single branched and double branched are present in 42. 4% and 45. 6%respectively. The rectosigmoid artery is from 0--4 branches in number, but one (40%)and two (32. 8%) branches are more common. Within the area supplied by the inferior mesenteric artery, the form of the anas-tomosis of the marginal arteries may be divided into three types. In 64% of the speci-mens, the marginal artery extends to the rectosigmoid arterial zone. The nomenclature of the lower branches of the inferior mesenteric artery and themarginal arteries and the "critical point" of Sudeck have been discussed.
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