mesonephros, pl. mesonephroi (mez´o-nef´ros, -roy) [NA]

One of three excretory organs appearing in the evolution of vertebrates; in life forms with a metanephros, the m. is located between the regressing pronephros and the metanephros, cephalic to the latter. In young mammalian embryos, the m. is well developed and briefly functional until establishment of the metanephros, the definitive kidney; in older embryos, the m. undergoes regression as an excretory organ, but its duct system is retained in the male as the epididymis and ductus deferens.middle kidney, wolffian body; [meso- + G. nephros, kidney]


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