摘要
利用透射电镜研究西施舌精子的发生和结构 ,揭示了从精原细胞逐渐发育为精子过程中细胞形态结构的变化和细胞器的演变规律。精细胞的分化分为 6期 ,主要包括 :核形态由扁圆到圆再到椭圆形 ;核染色质以颗粒状形式凝集 ;高尔基体分泌的前顶体颗粒聚合发育为前顶体囊 ,参与顶体的形成 ;线粒体逐渐融合与发达 ;中心体的移动及鞭毛的形成 ;胞质的逐步减少。成熟精子为原生型 ,由头部、中段和尾部组成。顶体圆锥状 ,高密度的顶体物质集中分布于基部四周 ,呈灯罩状 ;亚顶体腔呈尖锥状 ,内含密度较低的均匀物。细胞核近椭圆形。中段由 4个椭圆形的线粒体和 2个相互垂直的中心粒组成。尾部鞭毛为典型的“9+2”型结构。
The ultrastructure of spermatogenesis and spermatozoon of Coelomactra antiquata was observed with transmission electron microscope. Detailed observations and descriptions of morphological and structural changes of cells as well as transformation of cell organells were made submicroscopically from spermatogonia to spermatozoa.The spermatid differentiation can be divided into six stages. During spermatid differentiation, the main changes are as follow:elongation of nucleus, condensation of chromatin(in granular pattern), acrosome formation,development and fusion of mitochondria centriole shifting,and flagellar formation cytoplasmic sloughing. Mature sperms are of typical primitive type, consisting of three regions: head, middle piece and tail.The acrosome is conical. Acrosomal materials with a lampshade shaped structure lie round its base. The subacrosome space is conical with materials of low density. The nucleus is ellipsoidal. Four large ellipsoidal mitochondria and two centrioles make up the middle piece. The flagellum is a standard '9+2' microtubular structure.
出处
《水产学报》
CAS
CSCD
北大核心
2002年第2期97-104,共8页
Journal of Fisheries of China
