The third and final excretory organ that develops in a vertebrate embryo. In birds, reptiles, and mammals it replaces the mesonephros as the functional excretory organ and develops into the adult kidney.

• 后肾脊椎动物胚胎发育中的第三个也是最后一个排泄器官。在鸟类、爬行动物和哺乳动物中它代替中肾起排泄器官的作用，并最终发育成肾