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在研究胸腺时,过去多采用实验动物作用为材料,未报导过早期人胚新鲜胸腺的细微结构。后来由于发现了胸腺对细胞免疲的重要作用,因而引起大家重视对胸腺形态和其发育研究。以前很多研究工作集中于争论淋巴细胞究竟起于胸腺内部,还是胸腺外部?最近研究大白鼠时,提供了胸腺内部不产生淋巴细胞的证据。此外,也有人认为,这种动物的卵黄囊是
In the study of the thymus, the past, the role of experimental animals to use more materials, did not report the early human embryonic fresh thymus fine structure. Later, due to the discovery of the thymus on the important role of cell-free, which led to attention to the thymic morphology and developmental studies. Much of the previous work has focused on whether lymphocytes originate inside the thymus or outside the thymus. Recent studies in rats provided evidence that lymphocytes are not produced inside the thymus. In addition, some people think that this animal’s yolk sac is