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The mesonephric duct, also known as the Wolffian duct, is a embryonic duct that plays a role in the development of both the urinary and reproductive systems. In embryonic vertebrates, it serves as a tube carrying urine from the mesonephros (an intermediate kidney) to the cloaca, which is a common outlet for waste.1234

In males, the mesonephric duct persists and develops into the male reproductive system, including the epididymis and vas deferens. In females, a separate set of ducts, the paramesonephric (or Müllerian) ducts, develop alongside the mesonephric ducts. While the mesonephric ducts largely degenerate in females, they can form vestigial organs. The mesonephric duct is essential for the development of the mesonephros, which functions as the primary kidney in fish and amphibian larvae, and in the embryos of reptiles, birds, and mammals.12564

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