摘要
为了解乌梢蛇(Zaocys dhumnades)精子形成的规律,用透射电镜对其头部超微结构进行了观察。结果表明,乌梢蛇精子头部形成可分为4个阶段:阶段Ⅰ,前顶体囊泡内的颗粒物质融合形成1个顶体颗粒而发育为顶体囊泡,随着顶体囊泡的增大,在顶体囊泡与核膜之间形成了致密的纤维物质层。阶段Ⅱ,顶体囊泡变扁平,顶体颗粒分散在顶体囊泡内,前后囊泡膜逐渐相互融合,形成帽状顶体囊。阶段Ⅲ,细胞核离开中心位置移向精子细胞的一极,并在其周围开始有微管聚集,远端中心粒与近端中心粒出现,线粒体和内质网等其他细胞器移向精子细胞的另一极。阶段Ⅳ,细胞核周围汇聚大量微管,随着微管围绕细胞核的直径缩小,细胞核伸长为长卵圆形,同时顶体复合体也发育完成。
The ultrastructure of sperm head in Chinese Rat Snake Zaocys dhumnades was observed by transmission electron microscopy.According to the changes of the structure of axenomal complex,the typical sperm head formation could be divided into four stages.StageⅠ,when the preacrosomal vesicle approached the nucleus,the particulate materials in the preacrosomal vesicle came into being an acrosomal granule at the bottom of acrosomal vesicle.As the preacrosome became bigger,the subacrosomal granule changed to fibrous material layer.StageⅡ,the spermatid acrosomal vesicle flattened and the acrosomal granules dispersed in the acrosome vesicle.The vesicle membrane merged to form a cap-shaped acrosomal vesicle.StageⅢ,the nucleus moved from the center to the cell pole,and proximal centriole,distal centriole and microtubules appeared.Mitochondria and endoplasmic reticulum moved from the center to the other cell pole.StageⅣ,a large number of microtubules gathered around the nucleus.As the diameter of microtubules around the nucleus became smaller,acrosomal complex fully developed.
出处
《动物学杂志》
CAS
CSCD
北大核心
2011年第5期126-131,共6页
Chinese Journal of Zoology
关键词
乌梢蛇
精子头部
精子形成
超微结构
Zaocys dhumnades
Sperm head
Spermiogenesis
Ultrastructure
