Wolffian Duct Forms in One Day
1. Epithelialization of the pronephros and then the duct are the
first evidence of  mesenchymal to epithelial conversion.
2. The duct is absolutely required for urogenital system. In fact,
the first experiment in urogenital development was by
Boyden (1927)-interruption the cord and blocked the
formation of the kidney.
3. It forms in 24 hours -- novel mechanisms.