Anal sinuses
Open-knowledge reference entry

An anal sinus (rectal sinus) is a furrow formed between any two adjacent anal columns of the anal canal. An anal sinus is limited inferiorly by an anal valve (which unites the inferior ends of a pair of adjacent anal columns). The anal glands open into the anal sinuses.
References
External links
"Anatomy photo:43:11-0106". SUNY Downstate Medical Center. Archived from the original on March 5, 2016.
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This entry incorporates text from “Anal sinuses” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.