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Anus - Anatomy & Physiology (view source)

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==Structure==

[[Image:Sheep Anus.jpg|thumb|right|150px|Anus (Sheep) - Copywright RVC 2008]]

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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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