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用光镜与电镜技术,对15例7至28周人胚胎睾丸生殖细胞的发育进行了研究.结果:(1)据时间、位置及形态结构特点,将生殖细胞的发育过程初步分为三个阶段,即原始生殖细胞阶段,生殖母细胞阶段和前精原细胞阶段.其中前精原细胞阶段又经历了早、中、晚三个时期,各期出现的时间有交错.(2)14周是胚胎生殖细胞发育的一个重要时期.生殖细胞的增殖高峰、退化高峰以及前精原细胞初次出现均在此期.此期生殖细胞间还见到细胞连接,说明生殖细胞在胚胎时期即出现同步分化的现象.
The development of testicular germ cells in 15 cases of human embryos from 7 to 28 weeks was studied by light microscopy and electron microscopy.Results: (1) According to the characteristics of time, location and morphology, the development of germ cells was initially divided into three Stage, that is, the primordial germ cell stage, germ cell stage and pre-spermatogonia stage, which pre-spermatogonia stage has gone through three periods of early, middle and late, each period of time staggered. (2) 14 weeks Is an important period of embryonic germ cell development.The peak of reproductive proliferation, peak of degeneration and pre-emergence of pre-spermatogonia are in this period.Cell connections are also observed between germ cells in this period, indicating that germ cells are synchronized in the embryonic period The phenomenon of differentiation.