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Rectum - Anatomy & Physiology (view source)

259 bytes removed , 14:59, 14 July 2008

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*At the rectoanal junction, the lumen is constricted by longitudinal folds in the mucosa.

**These are normally pressed together to occlude the lumen.

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*There are ''two'' anal sphincters:

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**'''Internal anal sphincter''', formed by thickening of the circular smooth muscle of the gut and under autonomic control.

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**'''External anal sphincter''', formed from striated skeletal muscle and under voluntary control.

==Function==

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