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The pectinate 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.
It is an important anatomical landmark in humans, and several distinctions can be made based upon the location of a structure relative to this line:
Microscopic cross section of the anorectal junction.
Anatomy of the anus and rectum
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