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***Surrounds the anus.
 
***Surrounds the anus.
 
***Excretory ducts of the '''anal sacs''' open into this region.
 
***Excretory ducts of the '''anal sacs''' open into this region.
 +
*Sebaceous and apocrine sweat glands are associated with the anal sphincters.
    
==Species Differences==
 
==Species Differences==
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