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1. Synonym(s): external urethral sphincter
2. certain fibers of the levator ani.
ex·ter·nal u·re·thral sphinc·ter mus·cle(eks-tĕr'năl yūr-ē'thrăl sfingk'tĕr mŭs'ĕl)
Wilson,James, English anatomist, physiologist, and surgeon, 1765-1821.
Wilson muscle - (1) certain fibers of the levator ani; - (2) Synonym(s): sphincter urethrae