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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)
The anal valves are small valve-like folds at the lower ends of the anal sinuses in the rectum. The anal valves join together the lower ends of the anal columns.
This article incorporates text from a public domain edition of Gray's Anatomy.