AN ELECTRON MICROSCOPE STUDY OF SPERMATID DIFFERENTIATION IN THE TOAD, BUFO-ARENARUM HENSEL
AN ELECTRON MICROSCOPE STUDY OF SPERMATID DIFFERENTIATION IN THE TOAD, BUFO-ARENARUM HENSEL
复制标题
DOI：
10.1083/jcb.2.3.223
复制
发表时间：
1956-01-01
期刊：
影响因子：
--
通讯作者：
FAWCETT, DW
中科院分区：
文献类型：
--
作者：
BURGOS, MH;FAWCETT, DW
B精子细胞的分化。arenarum是从睾丸薄切片的电子显微镜研究中描述的。顶体从高尔基复合体发育的过程与哺乳动物精子发生的过程基本相同，但没有顶体颗粒形成。在本种中首次描述了穿孔。它是由核膜和头帽之间出现的致密细丝会聚而成。在精子成熟期间，染色质发生显着的物理化学变化。均匀分散在核质中的细染色质颗粒被越来越大的聚集体所取代，这些聚集体最终合并形成非常致密的精子头部。两个圆柱形的中心粒位于精子头部的基部附近。尾鞭毛的纵丝起源于其中一个，而波状膜的致密纤维物质与另一个密切相关。当考虑到与尾部的精细结构成分有关时，对活蟾蜍精子的游泳运动进行相差电影摄影观察表明，在起伏的膜中以及在轴向细丝中存在收缩成分。哺乳动物和两栖动物精子尾部的结构的差异进行了讨论，在其运动的特点的差异。
The differentiation of the spermatids of B. arenarum was described from a study of electron micrographs of thin sections of testis. The development of the acrosome from the Golgi complex takes place in much the same manner as in mammalian spermatogenesis but no acrosome granule is formed. A perforation is described for the first time in this species. It is formed by a convergence of dense filaments that arise between the nuclear membrane and the head cap. During maturation of the sperm the chromatin undergoes striking physicochemical alterations. Fine chromatin granules uniformly dispersed in the karyoplasm are replaced by larger and larger aggregates and these ultimately coalesce to form a very dense sperm head. Two centrioles of cylindrical form are situated very near the base of the sperm head. The longitudinal filaments of the tail flagellium take origin from one, and the dense fibrous substance of the undulating membrane is closely related to the other. Phase contrast cinematographic observations on the swimming movements of living toad sperm when considered in relation to the fine structural components of the tail suggest that there is a contractile component in the undulating membrane as well as in the axial filaments. The differences in the structure of mammalian and amphibian sperm tails are discussed in relation to differences in the character of their movements.