索氏六须鲶精子的超微结构

Ultrastructure of the spermatozoon of Silurus soldatovi

索氏六须鲶精子由头部、中段和尾部组成。头部呈球形或椭圆球形。核前端无顶体 ,后端有植入窝 ,核中染色质致密 ,有核泡。中段包括中心粒和袖套。近端中心粒由两个半圆形中心粒单体相对组成一个空心球体 ,空心处有一核样致密物质 ;远端中心粒呈钟罩形 ,顶端与近端中心粒相连 ,底部开口处与精子尾部轴丝端相连。袖套与细胞核后端相连 ,含有丰富的线粒体和囊泡。尾部主要结构是轴丝 ,为典型的“9+ 2”结构。尾部内没有囊泡及其它细胞器 ,尾部外表面光滑 ,没有鳍样结构。

The spermatozoon of Silurus soldatovi consists of head, middle piece and tail. The head is like a globe or an ellipsoid. There is no acrosome at the anterior end of the nuclears, whereas there is an implatation fossa at the posterior end of the nuclears, within which the chromatin is dense and nuclear vacuole(NV) is existent.The middle piece consists of the centrioles and the sleeve. Two single hemi global centrioles are opposite to each other,thus constituting the proximal centriole,an empty globe,which is nucleus dense. The distal centriole is like a bell, with its top connecting to the proximal centriole and with the entrance of its bottom connecting to the axoneme of the sperm tail. The sleeve, which is rich in mitochondria and vesicles, is connected to the posterior end of the nucleus. The main structure of the tail is axoneme,which is the structure of a typical “9+2”. There are no vesicles nor other cell organelles in the tail. The outer surface of the tail is quite smooth without fin like structure.