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Pectinate line

Line dividing the upper two-thirds and the lower third of the anal canal From Wikipedia, the free encyclopedia

Pectinate line
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The pectinate line (dentate line) is a line which divides the upper two-thirds and lower third of the anal canal. Developmentally, this line represents the hindgut-proctodeum junction.

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It is an important anatomical landmark in humans, and forms the boundary between the anal canal and the rectum according to the anatomic definition.[1] Colorectal surgeons instead define the anal canal as the zone from the anal verge to the anorectal ring (palpable structure formed by the external anal sphincter and the puborectalis muscle).[1] Several distinctions can be made based upon the location of a structure relative to the pectinate line:

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