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Equine species appear to lack the ability to control the external anal sphincter.
Equine species appear to lack the ability to control the external anal sphincter.
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==Histology==
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*Epithelium is columnar.
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*Goblet cells are present in the mucosa.
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===Recto-Anal Junction===
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[[Image:Recto-Anal Junction.jpg|thumb|right|150px|Recto-Anal Junction © RVC 2008]]
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*Termination of the lamina muscularis and longitudinal layer of the tunica muscularis.
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*The circular layer of the tunica muscularis forms the internal anal sphincter.
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*The external anal sphincter is formed from skeletal muscle.
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*Epithelium changes from columnar to stratified squamous non-keratinised.
==Links==
==Links==