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==Histology==
 
==Histology==
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[[Image:Anal Sacs.jpg|thumb|right|150px|Anal Sacs- 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:
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***Stratified squamous keratinised epithelium.
 
***Stratified squamous keratinised epithelium.
 
***Surrounds the anus.
 
***Surrounds the anus.
***Excretory ducts of the anal sacs open into this region.
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***Excretory ducts of the '''anal sacs''' open into this region.
 
****Large, coiled apocrine tubules.
 
****Large, coiled apocrine tubules.
 
****Have many glands in their walls.
 
****Have many glands in their walls.
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