Intersphincteric groove

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intersphincteric groove
The interior of the anal canal and lower part of the rectum. (Line not shown but region is visible.)
Latin sulcus intersphinctericus
TA A05.7.05.012
FMA FMA:15715
Anatomical terminology

Hilton's white line is a boundary in the anal canal.[1]

Below it, lymphatic drainage is to the superficial inguinal nodes.[2]

Hilton's white line is slightly below the pectinate line, a landmark for the intermuscular border between internal and external anal sphincter muscles.

This line represents the transition point from non-keratinized stratified squamous epithelium of the anal canal to keratinized stratified squamous epithelium of the anus & perianal skin.[3]

In live persons the color of the line is white, hence the name.

It is named for John Hilton.[4]

See also[edit]


  1. ^ Ewing MR (July 1954). "The white line of Hilton". Proceedings of the Royal Society of Medicine 47 (7): 52530. PMC 1918929. PMID 13185975. 
  2. ^ "Pelvis". Retrieved 2007-12-09. 
  3. ^ "The Digestive System". Retrieved 2009-01-14. 
  4. ^ synd/3030 at Who Named It?