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Medical Definition of Ductus paramesonephricus
1. Either of the two paired embryonic tubes extending along the mesonephros roughly parallel to the mesonephric duct and emptying into the cloaca; in the female, the upper parts of the ducts form the uterine tubes, while the lower fuse to form the uterus and part of the vagina; in the male, vestiges of the ducts form the vagina masculina and the appendix testis. Synonym: ductus paramesonephricus, Muller's duct, mullerian duct. (05 Mar 2000)