Assertion: sigmoid colon's mesentery | /r/HasProperty | freed
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Source sentences:
text: Furthermore, mobilizing the colon in this manner, where the mesentery is freed from the retroperitoneum at the midline peritoneal cavity, allows full exposure and isolation of the left ureter and kidney, prevents devascularization of the colon through distal transection of its mesentery, and provides maximal colonic length for a proper anastomosis.