Which muscle is damaged when a person suffers from passive leakage?

Is it internal or external anal sphincter? Facing an exam in a few weeks and currently kind of confused.List source, if possible =)
Answers:
Passive faecal incontinence or soiling--that is, faecal leakage without awareness--is usually associated with dysfunction of the smooth muscle tissue of the internal anal sphincter or with impacted stool in the rectum. Faecal urgency and urge incontinence are generally related to dysfunction of the striated muscle tissue of the external anal sphincter or to high bowel pressures and a normal sphincter, seen in patients with irritable bowel syndrome or diarrhoea from other causes.

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Depends what is being passively leaked, and from what site.Example - passive leakage of blood back down the leg veins away from the heart would result from damaged vein valves.Passive leakage of brain fluid from the nose indicates a tear in the dura mater covering the brain.Passive leakage of information to inappropriate sources results from an injured sense of loyaltyPassive leakage of semen or any of its components thru the tip of the penis indicates damage to, at the very least, the valve that switches during orgasm to allow semen to flow from the penis, instead of urine.In the case of urine leakage, the likely culprit is the bladder outlet muscle, a muscle that sits at the base of the pelvis, and opens when we relax it in order to pass urine intentionally.Passive leakage of stool results from damage to the anal sphincter.So, in short, passive leakage of any liquid or other substance results from damage to whatever structure normally holds the said substance inside at the place of leakage.

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