Metanephros
anatomy
metanephros, permanent kidney in reptiles, birds, and mammals, developing by the 10th week in human embryos from the lower part of the Wolffian duct, and replacing the embryonic structure called the mesonephros. It consists of a compact, paired organ containing many nephrons; a ureter separate from the Wolffian duct leads from the metanephros to the bladder.
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