Wolffian duct

Japanese: Wolffian duct（英語表記）Wolffianduct

…The pronephric duct, which becomes unnecessary when the mesonephros starts functioning, is also called the Müllerian duct, and degenerates in males but persists in females to become the oviduct. The mesonephric duct is called the Wolffian duct, and becomes the vas deferens in males of reptiles and above, where the mesonephros degenerates, and degenerates in females. The external shape also differs depending on the animal, and generally there is a pair of left and right, but the left and right are fused in cartilaginous fish and bony fish, and there are various types ranging from the bean-shaped kidney commonly seen in mammals to the lobular kidney consisting of many small kidneys (Figure 3). …

From [Genitals]

…In other words, in the early fetal period, one pronephros is formed on each side of the body, and one pronephros duct emerges from each pronephros. When the pronephros eventually degenerates, the mesonephros (also called the protonephros) is formed behind it, and the pronephros duct becomes the mesonephros duct, which is called the Wolffian duct. At that time, one Müllerian duct (Müllerian duct) is formed on each side, running parallel to the outside of this duct, but these two ducts will later follow different fates depending on the gender. …

*Some of the terminology that mentions "Wolffian duct" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…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。中腎輸管はウォルフ管Wolffian ductと呼ばれ，中腎が退化する爬虫類以上の動物の雄では輸精管となり，雌では退化する。　外形も動物により異なり，一般には左右1対であるが，軟骨魚類や硬骨魚類のように左右が融合したり，鳥類のように前･中･後葉と3葉に分葉したり，哺乳類の腎臓でも普通にみられるソラマメ型から多くの小腎からなる葉状腎をもつものまで多様である(図3)。…

【性器】より

…すなわち，胎生期の初期に前腎が体の左右に各1個でき，前腎からは，それぞれ1本の前腎輸管が出ている。やがて前腎が退化すると，その後方に中腎(原腎ともいう)ができ，前腎輸管はそのまま中腎輸管となるが，これをウォルフ管Wolffian ductという。そのころ，この管の外側を並行して走るミュラー管Müllerian ductが左右各1本できるが，これら二つの管はその後男女によって異なる運命をたどることになる。…

※「Wolffian duct」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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