Colon and Rectum - College of American Pathologists

Dentate line is the landmark where the squamous mucosa of the anus transitions to the columnar mucosa of the rectum. The dentate line is located in the middle of the anorectal ring, which comprise both the external and internal sphincter. These muscles provide a high-pressure zone (responsible for continence) extending 1-3 cms proximal to the ... ................
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