Rectal ampulla

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Rectal ampulla
Penis.svg
The rectum can be seen the left of this illustration. Ampulla visible but not labeled.
Latin ampulla recti
Gray's p.1183
Anatomical terminology

The rectal ampulla is the dilated section of the rectum where feces are stored until they are eliminated via the anal canal. The caliber of the rectum at its commencement is similar to that of the sigmoid colon, but near its termination it dilates, forming the ampulla.

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