…In cyclostomes, cartilaginous fish, bony fish, and amphibians, the mesonephros functions as the kidney for life. In vertebrates above reptiles, the mesonephros also degenerates, and the metanephros develops behind it, which serves as the kidney for life, i.e. the terminal kidney, and performs the excretory function. The pronephric duct, which becomes unnecessary when the mesonephros begins to function, is also called the Müllerian duct, and degenerates in males but persists in females to become the oviduct. … *Some of the terminology explanations that mention "metanephros" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…円口類,軟骨魚類,硬骨魚類,両生類では中腎が生涯の腎臓として働く。爬虫類以上の脊椎動物では中腎も退化し,さらにその後方に後腎metanephrosが発達して,それが生涯の腎臓,すなわち最終腎として排出作用を営む。中腎が働きだすと不用になる前腎輸管はミュラー管Müllerian ductとも呼ばれ,雄では退化するが雌では存続して輸卵管となる。… ※「metanephros」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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