Tightening of anus sphincter
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What is the anal sphincter?
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Description:This is normally automatic, you don't have to think about doing it. The outer ring of muscle is the external sphincter, which is a voluntary muscle which you can tighten up to close it more firmly if you have urgency or diarrhoea. Both muscles wrap right around the anus. When a stool comes into the rectum the internal sphincter.