Bursa of Fabricius (English spelling) bursa Fabricii [Latin]

Japanese: ファブリキウス囊 - ファブリキウスのう(英語表記)bursa Fabricii[ラテン]
Bursa of Fabricius (English spelling) bursa Fabricii [Latin]
A sac-like structure of lymphatic tissue found on the dorsal side just inside the cloaca in young birds. It was named after the Italian anatomist Fabricius, who described it in 1621 (published posthumously). The bursa of Fabricius is found only in birds, and plays an essential role in the development of antibodies in birds. The bursa of Fabricius in chickens begins to differentiate on about the fourth day of incubation, and tissue differentiation is almost complete by the time the chicken hatches. The size of the sac then reaches its maximum 2 to 3 months after hatching, after which it atrophies and disappears with sexual maturity.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
幼若期の鳥類において,総排出腔のすぐ内側の背側にみられる囊状構造のリンパ組織。イタリアの解剖学者ファブリキウスが1621年に記載(死後公刊)したので,この名がある。ファブリキウス囊は鳥類だけにみられ,鳥類の抗体産生能の発達に不可欠な役割を果たしている。ニワトリのファブリキウス囊は,孵卵4日目ころから分化しはじめ,孵化時には組織分化をほとんど完了している。その後,囊の大きさは孵化後2~3ヵ月で最大に達した後,性的成熟にともなって萎縮退化し,消滅する。

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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