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Other Terms: Mesentery of ascending colon, Mesocolon ascendens, Mésocôlon ascendant
The ascending and the descending mesocolon connect the corresponding portions of the colon to the posterior wall of the abdominal cavity. They are continuous with the transverse mesocolon. Both the ascending and the descending colon are covered throughout their anterior two-thirds with peritoneum. The posterior third is where the layers of the mesocolon diverge, destitute of peritoneum. This latter portion of the wall of the bowel is connected with the posterior wall of the abdominal cavity by loose connective tissue in which there is more or less fat. In some instances, the ascending and particularly the descending colon are completely surrounded by peritoneum. The ascending and the descending mesocolon are seldom present as distinct double folds of peritoneum, nor do they often cover more than the front and sides of the ascending and the descending portion of the colon. The ascending and descending mesocolons consist of two layers, a lateral and a medial. Beneath the medial layer, the blood vessels, the lymphatics, and the nerves pass through extraperitoneal connective tissue to the ascending and the descending colon.