| 摘要: |
| 利用透射电镜观察沟纹巴非蛤(Paphia exarata Philippi)精子的发生和精子的超微结构,揭示了从精原细胞逐渐发育成精子过程中超微结构的变化。其过程主要包括核逐步拉长、染色质浓缩、顶体形成、线粒体逐渐融合、胞质减少以及中心粒演变为轴丝等。精细胞的分化可分为五个时期。成熟精子属原生型,由头部、中段和尾部三部分组成。头部顶体呈圆锥状,其中的顶体物质分布不均匀,基部密度较其他区域高;亚顶体腔呈倒V字型,内含均匀的低密度物质。细胞核卵圆形。中段由4～5个椭圆形线粒体和2个相互垂直的中心 |
| 关键词: 沟纹巴非蛤(Paphia exarata Philippi) 精子 精子发生 超微结构 |
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| Observation on the ultrastructure of spermatogenesis of Paphia exarata Philippi |
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| Abstract: |
| The ultrastructures of spermatogenesis and spermatozoon of Paphia exarata Philippi were observed with transmission electronic microscope. The result shows the ultrastructural chaoges from spermatogonium to spermatozoon. During the spermatid differentiation, the main changes include as follows: gradual elongation of nucleus, condensation of chromatin, acrosome formation, development and fusion (of mitochondria), cytoplasmic slougling and flagella formation. The spermatid differentiation can be divided into five stages. Mature sperms are of typical primitive type, consisting of three regions: head, middle piece and tail. The acrosome is conical. The distribution of acrosomal materials is uneven,the density of acrosome’s base is higher than that of other area. The subacrosome space with materials of low density is V-shaped in upside-down. The nucleus is egg-shaped. Four or five ellipsoidal mitochondria and two centrioles make up the middle piece .The flagellum is a typical "9+2"microtubular structure. |
| Key words: Paphia exarata Philippi spermatozoon spermatogenesis ultrastructure |
