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| inferior mesenteric artery | |
|---|---|
| Name | Inferior mesenteric artery |
| Latin | Arteria mesenterica inferior |
| Caption | Arterial supply of the abdominal organs |
| Branchfrom | Abdominal aorta |
| Branches | Left colic artery; Sigmoid arteries; Superior rectal artery |
| Supplies | Distal transverse colon; Descending colon; Sigmoid colon; Rectum |
inferior mesenteric artery is a major unpaired visceral artery arising from the anterior aspect of the abdominal aorta that supplies the distal hindgut. It originates inferior to the superior mesenteric artery and superior to the aortic bifurcation near the level of the third lumbar vertebra, contributing to collateral networks that include the marginal artery of Drummond. Knowledge of its anatomy is central to procedures performed by clinicians at institutions such as Mayo Clinic, Johns Hopkins Hospital, Cleveland Clinic, and during surgical training in programs affiliated with Harvard Medical School or Oxford University Hospitals.
The inferior mesenteric artery originates from the anterior surface of the abdominal aorta around the level of L3, between landmarks used in imaging like the iliac crest and the xiphoid process. Its initial course runs inferiorly and leftward, coursing retroperitoneally anterior to structures including the left psoas major, left ureter, and near the medial border of the left kidney. Relations encounter anatomical sites familiar to surgeons at centers such as Mount Sinai Hospital and radiologists trained at Massachusetts General Hospital. The artery gives off mesenteric branches that communicate with branches of the superior mesenteric artery via the marginal artery, a concept taught in curricula at Stanford University School of Medicine and University of Cambridge School of Clinical Medicine.
Classic branches include the left colic artery, several sigmoid arteries, and the superior rectal artery. The left colic artery typically divides into ascending and descending branches that anastomose with the middle colic branch of the superior mesenteric artery and the ascending branches supplying the transverse colon; these anastomoses relate to concepts presented in texts used at Imperial College London and University College London. Sigmoid arteries—usually two to four—supply the sigmoid colon and form arcades analogous to those described in atlases used at Karolinska Institutet and University of Toronto. The superior rectal artery continues into the pelvis to supply the rectum and anastomoses with branches from the internal pudendal artery and inferior rectal branches recognized in surgical practice at Royal College of Surgeons of England and American College of Surgeons training courses.
Embryologically, the inferior mesenteric artery arises from the vitelline arterial plexus linked to the dorsal aorta during foregut, midgut, and hindgut partitioning in stages described in embryology teaching at University of Oxford and Johns Hopkins University School of Medicine. Its territory corresponds to the hindgut derived from the caudal end of the primitive gut tube, a developmental region discussed alongside events such as the formation of the cloaca and partitioning by the urorectal septum in lectures at UCL Great Ormond Street Institute of Child Health and Yale School of Medicine. Variations in origin, number of branches, and presence of accessory mesenteric arteries are topics of vascular anomaly reports from centers like Karolinska University Hospital and Toronto General Hospital.
Functionally, the inferior mesenteric artery supplies arterial blood to the distal transverse colon, descending colon, sigmoid colon, and upper rectum. These territories are clinically correlated with perfusion patterns evaluated by multidisciplinary teams at Mount Sinai Hospital and Mayo Clinic, and with ischemic colitis presentations often discussed in grand rounds at Cleveland Clinic and Massachusetts General Hospital. The artery participates in collateral circulation via the marginal artery and arcades that preserve perfusion during occlusion, a principle applied during colorectal resections at institutions such as Memorial Sloan Kettering Cancer Center and The Royal Marsden Hospital.
Pathology involving the inferior mesenteric artery includes atherosclerotic occlusive disease, embolic events, aneurysm formation, and traumatic injury, conditions managed in vascular units like those at Guy's and St Thomas' NHS Foundation Trust and Addenbrooke's Hospital. Ischemic colitis of the left colon is often attributable to compromised flow in the artery, a diagnosis encountered in emergency departments at Royal Victoria Infirmary and Charité – Universitätsmedizin Berlin. Oncologic resections for colorectal cancer require ligation or preservation decisions regarding the inferior mesenteric artery, guided by surgical oncology protocols from MD Anderson Cancer Center and clinical trials coordinated by networks such as National Cancer Institute-linked groups. Iatrogenic injury can occur during aortic surgery performed at centers including Mayo Clinic Hospital and Cleveland Clinic Foundation.
Imaging modalities for evaluation include computed tomography angiography and digital subtraction angiography performed in radiology suites at Royal Hallamshire Hospital and Mount Sinai Beth Israel, and intraoperative assessment using indocyanine green fluorescence angiography reported from teams at Vanderbilt University Medical Center and University of Michigan Health. Surgical considerations include high versus low ligation during sigmoid colectomy or anterior resection—a decision influenced by lymphatic mapping studies from Memorial Sloan Kettering Cancer Center and randomized trials coordinated by consortia such as National Institutes of Health networks. Knowledge of variant anatomy, collateral pathways, and perioperative risk management is essential for vascular surgeons and colorectal teams at institutions like St Bartholomew's Hospital and Toronto Western Hospital.
Category:Arteries of the abdomen