in reptiles, birds, and mammals, it atrophies and for the most part disappears rapidly as the permanent kidney (metanephros) develops beginning during the sixth or seventh week, so that by the beginning of the fifth month only the ducts and a few of the tubules of the mesonephros remain.

Development in male

In the male, the Wolffian duct persists, and forms for example the epididymis, the ductus deferens,

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