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→Histology
==Histology==
==Histology==
[[Image:Anal Sacs.jpg|thumb|right|150px|Anal Glands- Copywright RVC 2008]]
[[Image:Anal Glands.jpg|thumb|right|150px|Anal Glands- Copywright RVC 2008]]
*At the anus, the columnar intestinal epithelium is replaced by the stratified squamous keratinised epithelium of the skin.
*At the anus, the columnar intestinal epithelium is replaced by the stratified squamous keratinised epithelium of the skin.
*As the muscosa changes from columnar to cutaneous, three zones are created:
*As the muscosa changes from columnar to cutaneous, three zones are created: