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