- Splenic flexure anchored to diaphragm via phrenocolic ligament
- Secondarily retroperitoneal location of descending colon
- Transition from descending to sigmoid colon within left iliac fossa
- Sigmoid located intraperitoneally (àsigmoid mesocolon)
- Transition from sigmoid to rectum anterior to second / third sacral vertebra
-
Descending and sigmoid colon
![Descending and sigmoid colon]()
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Blood supply
![Blood supply]()
- Superior (medial colic artery) and inferior mesenteric artery (left colic artery) anastomose close to the splenic flexure(arc of Riolan)
- Arterial blood supply of the left hemicolon, sigmoid and upper rectum by the inferior mesenteric artery (left colic artery, sigmoid arteries with marginal artery of Drummond, superior rectal artery)
- Venous drainage into the portal system mirrors the arterial blood supply
Topography
Cephalocaudad the descending colon is in close relation with the spleen (splenic flexure), omental
Cephalocaudad the descending colon is in close relation with the spleen (splenic flexure), omental
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