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==Structure==
 
==Structure==
[[Image:Sheep Anus.jpg|thumb|right|150px|Anus (Sheep) - Copywright RVC 2008]]
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[[Image:Sheep Anus.jpg|thumb|right|150px|Anus (Sheep) - © RVC 2008]]
 
*There are ''two'' anal sphincters:
 
*There are ''two'' anal sphincters:
 
**'''Internal anal sphincter''', formed by thickening of the circular smooth muscle of the gut and under autonomic control.
 
**'''Internal anal sphincter''', formed by thickening of the circular smooth muscle of the gut and under autonomic control.
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