Anal sinuses

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Anal sinuses
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Coronal section of rectum and anal canal
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The interior of the anal cami and lower part of the rectum, showing the anal columns and the anal valves between their lower ends (the columns were more numerous in the specimen than usual)
Latin Sinus anales
Gray's p.1185

The anal sinuses (rectal sinuses) are furrows in the anal canal, that separate the anal columns from one another. The anal sinuses end below in small valve-like folds, termed anal valves.

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This article incorporates text from a public domain edition of Gray's Anatomy.

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