栉孔扇贝精子形成过程的超微结构研究

STUDY ON THE ULTRASTRUCTURE OF SPERMIOGENESIS OF SCALLOP, Chlamys farreri

通过电镜观察，描述了栉孔扇贝精子形成过程的超微结构变化。栉孔扇贝的精子 形成过程可分为早期、中期和后期３个阶段。（１）早期：细胞核呈团块状，近端中心粒移向精 子细胞核的后端并嵌在核的凹窝处，在被观察的视野内，可见到大量与精子细胞分离的成 熟鞭毛。（２）中期：核由团块状向流线型转变。顶体泡向帽状顶体转变，顶体下间隙开始出 现。近端中心粒分化出中心粒卫星体。（３）后期：精子细胞核变成上窄下宽的长柱状。形成 帽状顶体和顶体下间隙。中心粒复合体形成，形成具顶体、鞭毛的成熟精子。

The ultrastructure of spermiogenesis of Chlamys farreri was observed with EM. The spermiogenesis consists of three stages. (1)Early stage: aproximal centriole inserts the implantation fossa behind the lump nuclear. A large number of flagellums were observed around lump nuclear. (2)Middle stages: the nuclear changes from lump to streamline. Preacrosome vesicle changes shape and become acrosome and subacrosmal space. The centriolar satellite was disintegrated from the proximal centriole. (3)End stages: acrosome and subacrosmal space cover on the top of the barrel-shaped nuclear, the centriole tubes form, and a mature sperm appears.