![]() ![]() The hepatic flexure lies in the right upper quadrant of the human abdomen. dorsal flexure one of the flexures in the mid-dorsal region of the embryo. The right colic flexure or hepatic flexure (as it is next to the liver) is the sharp bend between the ascending colon and the transverse colon. The arch between the right colic and the ileocolic arteries seems to be absent in approximately 6% of all cases. colic flexure, right the angular junction of the ascending and transverse colon. the colon bends to form the right colic flexure (hepatic flexure) and becomes the transverse colon. This anastomosis between the superior and inferior mesenteric arteries is absent in approximately 2% of all cases, and in a further 3% it is very small. From left to right, LM x 56, LM x 508, EM x 196,000. Normally the anastomosis along the colon formed by different arches (marginal artery) is large enough to ensure a sufficient collateral circulation (anastomosis of Riolan). if accessory branches from the inferior mesenteric artery are present, arteries supply the transverse colon up to the right colic flexure. Accessory middle colic arteries have been described as branches of the gastroduodenal or left gastroepiploic arteries. Accessory middle colic arteries are of clinical importance, since in such cases the arterial blood supply of the colon by the superior mesenteric artery is extended to the left colic flexure or even as far as the descending colon. 1 – 16 The ileocolic artery is the most variable of the colic branches from the superior mesenteric artery. The left colic flexure is less mobile than the right and is attached to the diaphragm through the phrenocolic ligament. The gastroduodenal arteries (see Chapter 14 and 17), the jejunal, and ileal arteries are not depicted, but the arteries supplying the colon, cecum, and appendix are outlined in detail. 20 Superior Mesenteric Artery and Colic Arteries ![]()
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