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Anus - Anatomy & Physiology (view source)

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***Surrounds the anus.

***Excretory ducts of the '''anal sacs''' open into this region.

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*Sebaceous and apocrine sweat glands ~~are associated~~ with the anal sphincters.

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*Sebaceous and apocrine sweat glands both occur in this region an with the anal sphincters.

==Species Differences==

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