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yolk bag 【生物學】卵黃囊。

yolk sac

After thymus transplantation , the embryo ' s thymus has trunk cell that comes from the embryo ' s yolk bag , embryo liver and marrow , it excretes a great deal of thymus hormone which change lymphocyte into mature t lymphocyte through multiplication and differentiation , then it help to turn b cell into serous cell , the quantity of the serous cell increases , the antibody that it produces also increases , that is the content of iga , igm and igg is increased 而移制胎兒胸腺后,由于胎兒胸腺內有來自胎兒卵黃囊、胚肝和骨髓的干細胞,并能分泌大量胸腺素,促進淋巴細胞在該處增殖、分化為成熟t淋巴細胞,繼而輔助b細胞活化成為漿細胞,漿細胞數量增加,產生的抗體量增加,即igg , igm , iga含量增加。