Inferior mesenteric artery
In human anatomy, the inferior mesenteric artery, often abbreviated as IMA, is the third main branch of the abdominal aorta and arises at the level of L3, supplying the large intestine from the distal transverse colon to the upper part of the anal canal. The regions supplied by the IMA are the descending colon, the sigmoid colon, and part of the rectum.
|Inferior mesenteric artery|
Abdominal part of digestive tube and its attachment to the primitive or common mesentery. Human embryo of six weeks. (Inferior mesenteric artery labeled at bottom right.)
|Branches||left colic artery, sigmoid branches, superior rectal artery|
|Vein||inferior mesenteric vein|
|Latin||arteria mesenterica inferior|
Proximally, its territory of distribution overlaps (forms a watershed) with the middle colic artery, and therefore the superior mesenteric artery. The SMA and IMA anastomose via the marginal artery of the colon (artery of Drummond) and via Riolan's arcade (also called the "meandering artery", an arterial connection between the left colic artery and the medial colic artery). The territory of distribution of the IMA is more or less equivalent to the embryonic hindgut.
The IMA branches off the anterior surface of the abdominal aorta below the renal artery branch points, 3-4 cm above the aortic bifurcation (into the common iliac arteries) at the L3 vertebral level.
|left colic artery||supplies descending colon|
|sigmoid branches||the most superior being described as 'the superior sigmoid artery'|
|superior rectal artery||effectively the terminal branch of the IMA (the continuation of the IMA after all other branches)|
Surgery and pathologyEdit
The IMA and/or its branches must be resected for a left hemicolectomy.
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- Lotti M. Anatomy in relation to left colectomy
- Anatomy figure: 39:02-05 at Human Anatomy Online, SUNY Downstate Medical Center - "Branches of the inferior mesenteric artery."
- Anatomy photo:40:11-0103 at the SUNY Downstate Medical Center - "Posterior Abdominal Wall: Branches of the Abdominal Aorta"
- Anatomy image:7924 at the SUNY Downstate Medical Center
- Anatomy image:7997 at the SUNY Downstate Medical Center
- Anatomy image:8407 at the SUNY Downstate Medical Center
- Anatomy image:8659 at the SUNY Downstate Medical Center
- Atlas image: abdo_wall70 at the University of Michigan Health System - "Posterior Abdominal Wall, Dissection, Anterior View"
- sup&infmesentericart at The Anatomy Lesson by Wesley Norman (Georgetown University)