A member asked:

I just want to ask how far is mucus membrane from anus opening ? is it inside inner sphincter ? someone told me it is 2 to 3 cm from the opening?

A doctor has provided 1 answer
Dr. Robert Killian answered

Specializes in General Practice

STD risk: All tissue inside the anus is at risk for infection.

Answered 7/13/2017

4.6k views

Thank

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