褶纹冠蚌精子的超微结构研究
STUDIES ON ULTRASTRUCTURE OF THE SPERM OF FRESHWATER MUSSEL,CRISTARIA PLICATA
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摘要: 利用电镜技术对褶纹冠蚌精子的形态和结构作了研究.结果表明:精子全长约40-43μm,由头部、中段和鞭毛组成.头部呈子弹头形,长约2.6μm,直径约1.5μm,内含细胞核,核属浓缩型,外被核膜.5个球形的线粒体构成了精子的中段,中段长约0.6μm,最大直径约1.8μm.近端中心粒位于核基部的凹陷处,并通过致密的无定形的基质与远端中心粒相连.远端中心粒与鞭毛领之间通过9个围中心粒器紧密相连,鞭毛长约37-40μm.精子顶体退化,仅由几个顶体囊泡组成.Abstract: The morphology and ultrastructure of the sperm of Cristaria plicata were studied with electron microscope. The results show that the sperm is 40-43μm long and consists of the head,the middle piece and the flagellum. The 1.5×2.6μm sperm head is bullet shaped and contains a nucleus which is condensed and delimited by a nuclear membrane. The middle piece(0.6μm long)composes of five spherical mitochondria. A proximal centriole is locatesd in a fossa in the nucleus base and connects to a distal centriole by a dense amorphous matrix. The distal centriole is located to the flagellar collar. The flagellum is 37-40μm long. A very reduced acrosome is only composed of several acrosomal vesicles.
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Keywords:
- Cristaria plicata /
- Sperm /
- Ultrastructure
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