Colon and Rectum - College of American Pathologists

The transition from sigmoid to rectum is marked by the fusion of the tenia coli of the sigmoid to form the circumferential longitudinal muscle of the rectal wall approximately 12 to 15 cm from the dentate line.1 . The rectum is defined clinically as the distal large intestine commencing opposite the sacral promontory and ending at the upper ... ................
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