Pudendal nerve and external anal sphincter? - USMLE Forums
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Old 10-17-2012
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Anatomy Pudendal nerve and external anal sphincter?

hello

I read that the external anal sphincter is voulntary and is supplied by pudendal nerve, and that the external anal sphincter is closed all the time but it relaxes when the person wants to defecate

my question is: does pudendal nerve constricts or relaxes the external anal sphincter? and what nerve keeps it closed all the time? and what happens if there is a pudendal nerve injury? does it cuase constipation or fecal incontinence?
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Old 10-21-2012
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isn't there any answer?
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Old 10-21-2012
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tonicity of this muscle as other muscle is maintained by pudendal nerve , wich keep it closed (normaly) , and when stuff are full in rectum and being forced by yourself (valsava manuever ) so that to get out , then this is willing open of this muscle . so if u damage pudendal , simply means u gona have the anal canal which open 24/7 coz u destroy its tonicity .
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