inferior mesenteric artery


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in·fe·ri·or mes·en·ter·ic ar·ter·y

[TA]
origin, at the L3 vertebral level as the third and smallest anterior visceral branch of the abdominal aorta; branches, left colic, sigmoid, superior rectal; anastomoses, middle colic and middle rectal.

in·fe·ri·or mes·en·ter·ic ar·te·ry

(in-fēr'ē-ŏr mez'en-ter'ik ahr'tĕr-ē) [TA]
Origin, abdominal aorta; branches, left colic, sigmoid, superior rectal; anastomoses, middle colic and middle rectal.
Synonym(s): arteria mesenterica inferior.

inferior mesenteric artery

The third unpaired midline artery that branches from the abdominal aorta; it originates 3 to 4 cm proximal to the aortic bifurcation. It supplies blood to the hindgut, i.e., the distal half of the transverse colon, the descending colon, the sigmoid colon, and the rectum. Its branches include the left colic, sigmoid, and superior rectal arteries.
See: aorta (Branches of aorta), circulation (Circulation of blood through heart and major vessels) for illus.
See also: artery
References in periodicals archive ?
Nearly two-thirds (62%) of patients with cancerous nodes below the inferior mesenteric artery also had involved nodes above the artery that would not have been detected without high para-aortic dissection.
Inferior mesenteric artery collaterals to the uterus during uterine artery embolization: prevalence, risk factors, and clinical outcomes.
Most commonly embolus is seen in superior mesenteric artery, because of its more favourable angle with the aorta rather than celiac artery or inferior mesenteric artery. Typically, embolus lodges at the major branch distal to the middle colic artery, preserving the blood supply of transverse colon and proximal jejunum.
In this case of a 47-year-old male who was diagnosed as acute on chronic mesenteric ischaemia with massive bowel gangrene, who underwent massive resection and end-to-end anastomosis of small bowel survived in spite of more than 50% stenosis and thrombotic occlusion of Superior Mesenteric Artery and Inferior Mesenteric Artery. Anastomotic survival followed by massive resection of bowel with thrombosis is very rare and so this case is presented for its rarity.
SA is one of the branches of artery of foregut i.e., CT, and in our case SA is giving one branch to supply the transverse colon near splenic flexure which is usually supplied by inferior mesenteric artery (artery of hindgut), may be due to the ramification in arterial development.
The terminal branch of the inferior mesenteric artery is the superior rectal artery (12).
The left colic artery arose SMA but not from the inferior mesenteric artery. The middle colic artery divided into right and left branches.
The descending branch of left colic artery anastomosed with higher sigmoid branch of Inferior mesenteric artery (Fig 5).
In our report, it is present below the origin of inferior mesenteric artery. The measurements of the kidneys considered individually had small variations, but were within expected limits.
In the present case, a renal artery for each kidney was found that originated as lateral branches of the abdominal aorta and an accessory renal artery to the lower pole of the left kidney, arising from the aorta distal to the origin of inferior mesenteric artery. Graves (6) described 'extra' or 'aberrant and anomalous' arteries were in fact normal segmental vessels whose origin was more proximal than usual and these extra or aberrant source of supply to that part provided by the main renal stem.
[9] In the present case the kidney was supplied by (hilar renal artery) & lower polar artery, which arose from the aortic bifurcation below the origin of inferior mesenteric artery. Ronald-Eisendrath (1920) after examination of 1237 kidneys by various investigators revealed that the occurrence of lower polars from aorta in 71 of 1237 kidneys or nearly 0.6%,.
below the MRA & 1.5 cm below Inferior Mesenteric Artery (IMA).

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