Anismus (or dyssynergic defecation) refers to the failure of the normal relaxation of pelvic floor muscles during attempted defecation. Anismus can occur in both children and adults, and in both men and women (although it is more common in women). It can be caused by physical defects or it can occur for other reasons or unknown reasons. Anismus th...
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http://en.wikipedia.org/wiki/Anismus
(ә-niz´mәs) contraction of striated muscles of the pelvic floor instead of the normal relaxation when a person strains to defecate; the result is constipation.
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http://www.encyclo.co.uk/local/21001
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