【摘要】 观察北京鸭腔上囊胚胎发育中淋巴细胞发生、分化的形态学变化过程表明:(1)腔上囊淋巴细胞的来源是外源性的,是在胚胎12天左右,由血液进入腔上囊的淋巴干细胞发育、分化而来。(2)在淋巴干细胞向淋巴母细胞和中、小淋巴细胞的分化过程中,经过了前淋巴母细胞的阶段。前淋巴母细胞也是滤泡成熟后,淋巴细胞的生发细胞。前淋巴细胞可能与哺乳动物B淋巴细胞中的过渡细胞相类似。(3)淋巴滤泡中的淋巴母细胞,中、小淋巴细胞依据其形态特征,可以进而分为两型——Ⅰ型和Ⅱ型细胞。它们反映了同一种细胞所处的功能和生理状态的不同。更多还原

【Abstract】 The differentiation of lymphocyte of the Bursa of Fabricius in White Peking Duck embryo was studied with routine bistological methods under light microscope and transmission electron microscope 1.The immigration of the stem cells of lymphocyte from blood ressel to Bursa of Fabricius starts on day 12, increases to the maximum number on day 16 and ceases on day 20.2.Between the stem cell of lymphocyte and lymphoblast, there is a stage of prelymphoblast. They appear on day 14. Their morphology and structure are simillar to the transitional cell in the mammals. In the developing lymphoepithelium follicle of the Bursa of Fabricius, the pre-lymphoblasts are bounded in or near the marginal layer of the follicular medulla and maintain the capacity of differentiation to lymphoblast. 3.The lymphoblasts appear on day 18 and the medium and small lymphocytes appear two days after. According to the difference of the morphology and structure, two types of lymphoblast, medium lymphocyte and small lymphocyte can be distinguished.更多还原