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The contribution of mesonephric primordia to the final urinary system is zero. In the context of embryogenesis of the renal system, mesonephros can be considered as a transitory, temporary formation.

Mesonephros only contributes to the male internal genital system (while the paramesonephric duct is its counterpart for the internal female genital system).

FA states just this: "mesonephros - functions as interim kidney for 1st trimester, later contributes to male genital system".
i guess what u r saying is wrong because the uretric bud is derived from the mesonephros which makes up a the ureter till the collecting ducts
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