Pectinate line

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Overview

Pectinate line
Hemorrhoid.png
Pectinate line labeled at bottom center.
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The interior of the anal cami and lower part of the rectum, showing the columns of Morgagni and the anal valves between their lower ends. (Pectinate line visible but not labeled.)
Latin linea anocutanea
Dorlands/Elsevier l_10/12496033

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List of terms related to Pectinate line

The pectinate line (anocutaneous line, dentate line, anal verge, anorectal junction) is a line which marks the end of the rectum and the beginning of the anal canal. Developmentally, this line provides the hindgut and proctodeum junction.

It is an important anatomical landmark, and several distinctions can be made based upon the location of a structure relative to this line:

Distinction Above pectinate line Below pectinate line
destination of lymph drainage internal iliac lymph nodes, inferior mesenteric lymph nodes superficial inguinal lymph nodes
epithelium columnar epithelium (as is most of the digestive tract - the line represents the end of the part of the body derived from the hindgut) stratified squamous epithelium (as is most of the skin.)
blood superior rectal artery inferior rectal arteries
hemorrhoids classification internal hemorrhoids (not painful) external hemorrhoids (painful)
nerves inferior hypogastric plexus inferior rectal nerves

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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