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Anocutaneous line
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 [edit on Wikidata]

The anocutaneous line, also called the Hilton white line or intersphincteric groove, is a boundary in the anal canal.^[1]

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]

References

^ Ewing MR (July 1954). "The white line of Hilton". Proceedings of the Royal Society of Medicine. 47 (7): 525–30. doi:10.1177/003591575404700706. PMC 1918929. PMID 13185975.
^ "Pelvis". Archived from the original on 2007-10-21. Retrieved 2007-12-09.
^ "The Digestive System". Retrieved 2009-01-14.
^ synd/3030 at Who Named It?

Anatomy of the gastrointestinal tract, excluding the mouth

Pharynx	Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Pyriform sinus
Esophagus	Sphincters upper lower glands crop
Stomach	Curvatures greater lesser Angular incisure Cardia Body Fundus Pylorus Gastric mucosa Gastric folds Microanatomy Gastric pits Gastric glands Cardiac glands Fundic glands Pyloric glands Foveolar cells Parietal cells Gastric chief cells Enterochromaffin-like cells

Microanatomy	Intestinal villi Microvilli Intestinal glands Enterocytes Enteroendocrine cells Goblet cells Paneth cells
Duodenum	Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands
Jejunum	No substructures
Ileum	Ileocecal valve Peyer's patches Microfold cells

Cecum	Appendix
Colon	Ascending colon Hepatic flexure Transverse colon Splenic flexure Descending colon Sigmoid colon Continuous taenia coli haustra epiploic appendix
Rectum	Transverse folds Ampulla
Anal canal	Anus Anal columns Anal valves Anal sinuses Pectinate line Internal anal sphincter Intersphincteric groove External anal sphincter

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