pronephros

pronephros, pl. pronephroi (pro-nef´ros, -roy)

1. The definitive excretory organ of primitive fishes.head kidney; 2. In the embryos of higher vertebrates, a vestigial structure consisting of a series of tortuous tubules emptying into the cloaca by way of the primary nephric duct; in the human embryo, the p. is a very rudimentary and temporary structure, followed by the mesonephros and still later by the metanephros.forekidney, primordial kidney; [pro- + G. nephros, kidney]

 

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