斯氏狸殖吸虫精子形成的透射电镜观察

用透射电镜观察了斯氏狸殖吸虫精细胞的变化和精子的主要形态结构特征。从而揭示了该虫精子形成的过程。证实了斯氏狸殖吸虫的精细胞和精子有顶体结构。成熟的精子可分为头部和尾部。头部由核质充满,核质可延伸至精子尾部中段的前端。头尾之间为连接段。尾部又由中段和末段组成。尾部的中段起始部的两侧各有一条轴丝。每条轴丝各由9对外周微管和2个中央微管组成,在每2条中央微管的外围,均由一个纤维鞘包绕,其间形成一个车轮样的9 2微管系统结构,其腹侧排列着线粒体。尾部的末段,主要为2条紧靠的轴丝。

ULTRASTRUCTURAL OBSERVATION ON THE SPERMIOGENESIS OF PAGUMOGONIMUS SKRJABINI

The spermiogenesis of Pagumogonimus skrjabini was observed on the ultrastructural' level by trasmission electron microscopy. The development and the morphological characteristics of spermatids and sperm were studied. The Golgi comples was located near the anterior region of the spermatid nucleus and developed into an acrosomal cap of the sperm. Accordingly, an acrosomal structure of P. skrjabini was recognized in this study.The mature sperm of P.s. was composed of head and tail. The head part was filled with dense nucleus and the nucleoplasma extended into the anterior end of the median part of the sperm tail. A conjunction part was seen between the head and the tail. The tail was composed of a median part and a terminal part. At the beginning of median part of the tail, two axial filaments were found on each side. Each axial filament was composed of two central filaments and nine pairs of outer filaments. The two central filaments were surrounded by fibrous sheath, both of which were connected with spoke-like structures. Mitochondria were arranged in a line in the ventral portion of the central filaments. At. the terminal part of the tail, two axial filaments lay closely together.