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| Development of the urinary and reproductive organs ： ウィキペディア英語版 |
Development of the urinary system
The development of the urinary system as a part of the prenatal development, concerns the urinary system and sex organs. The latter is a part of the stages of sexual differentiation.
The urinary and reproductive organs are developed from the intermediate mesoderm. The permanent organs of the adult are preceded by a set of structures which are purely embryonic, and which with the exception of the ducts disappear almost entirely before the end of fetal life. These embryonic structures are on either side; the pronephros, the mesonephros and the metanephros of the kidney, and the Wolffian and Müllerian ducts of the sex organ. The pronephros disappears very early; the structural elements of the mesonephros mostly degenerate, but the gonad is developed in their place, with which the Wolffian duct remains as the duct in males, and the Müllerian as that of the female. Some of the tubules of the mesonephros form part of the permanent kidney.
==Pronephros and Wolffian duct==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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