Anocutaneous line
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The anocutaneous line, also called the Hilton white line or intersphincteric groove, is a boundary in the anal canal.[1]
Quick Facts Details, System ...
Anocutaneous line | |
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![]() The interior of the anal canal and lower part of the rectum. (Line not shown but region is visible.) | |
Details | |
System | Alimentary system |
Identifiers | |
Latin | linea anocutanea |
TA98 | A05.7.05.012 |
TA2 | 3019 |
FMA | 15715 |
Anatomical terminology |
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Below the anocutaneous line, lymphatic drainage is to the superficial inguinal nodes.[2]
The anocutaneous line is slightly below the pectinate line and a landmark for the intermuscular border between internal and external anal sphincter muscles.
The anocutaneous line represents the transition point from non-keratinized stratified squamous epithelium of the anal canal to keratinized stratified squamous epithelium of the anus and perianal skin.[3]
In live persons, the color of the line is white, hence the alternative name. It is named for John Hilton.[4]