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Wilson's muscle --> sphincter urethrae

origin, ramus of pubis; insertion, with fellow in median raphe behind and in front of urethra; action, constricts membranous urethra; nerve supply, pudendal.

Synonym: musculus sphincter urethrae, external urethral sphincter, guthrie's muscle, musculus compressor urethrae, musculus constrictor urethrae, musculus sphincter urethrae membranaceae, sphincter muscle of urethra, wilson's muscle.