Genitourinary Radiology > Embryology > Pro- & Mesonephros

Pro- & Mesonephros


Three successive sets of primitive excretory structures give rise to the mature kidneys—the pronephros, mesonephros, and metanephros. The pronephros develops in the third week of life, and regresses after inducing the maturation of the mesonephros during the fourth to eighth weeks. The mesonephros, which serves as excretory function during these weeks, quickly regresses. Its remnant is the Wolfiann duct, which, in males, develops into the efferest ductules of the testes, the epididymis, and the vas deferens; in females, the epioophoron and the paroophoron.

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