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pronephric duct
The pronephric duct is the predecessor of the Wolffian duct.
==Development==
The development of the pronephric duct is a part of the development of the urinary and reproductive organs.
In the outer part of the intermediate mesoderm, immediately under the ectoderm, in the region from the fifth cervical segment to the third thoracic segment, a series of short evaginations from each segment grows dorsally and extends caudally, fusing successively from before backward to form the pronephric duct. This continues to grow caudalward until it opens into the ventral part of the cloaca; beyond the pronephros it is termed the Wolffian duct. Thus, the Wolffian duct is what remains of the pronephric duct after the atrophy of the pronephros.
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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