Pectinate line
Pectinate line | |
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Details | |
Identifiers | |
Latin | linea pectinata, linea anocutanea |
TA98 | A05.7.05.009 |
TA2 | 3015 |
FMA | 29321 |
Anatomical terminology |
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.
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:
Distinction | Above pectinate line | Below pectinate line |
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Lymph drainage | internal iliac[1] | Hilton's white line )
|
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 ) |
anal verge becomes continuous with the perianal skin containing keratinized epithelium.)
|
Embryological origin[2] | endoderm | ectoderm |
Artery | superior rectal artery | middle and inferior rectal arteries |
Vein | superior rectal vein draining into the inferior mesenteric vein and subsequently the hepatic portal system | inferior rectal veins
|
Hemorrhoids classification | internal hemorrhoids (not painful) | external hemorrhoids (painful) |
Nerves | inferior hypogastric plexus | pudendal nerves |
Additional images
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Microscopic cross section of the anorectal junction.
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Anatomy of the anus and rectum
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Coronal section of rectum and anal canal.
References
- ISBN 978-0071831420.)
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: CS1 maint: multiple names: authors list (link - ISBN 9781455727919.