摘要
在扫描电镜下,泥鳅成熟卵卵膜孔外围呈现完整的左涡旋状结构,受精时精子是顺着涡旋的流线进入卵膜孔。涡旋纹理接近对数螺线。本文分析了真骨鱼类的受精因素,除已知的化学因素外,还存在物理因素。也讨论了泥鳅成熟卵卵膜孔形态形成的必然性。
The surrounding membranes (chorion) of the eggs in two Chinese fishes (Misgurnus anguillicaudatus, Mcgalobrama amblycephala) are all solid. The sperm penetrating into the mature egg is restricted in the micropylar cana! of the chorion. There is a funnel-like depression at the opening of the micropylar canal and an outer opening of the canal is situated at the bottom of the depression, therefore this depression is the vestibule of the micropyle apparatus. There are whirlpool-like structures on the bottom surface of the depression and the inner wall of the micropylar canal.
According to computation, there exist in the upper whirlpool of the micropyle powerful centripetal forces, which collect sperms and draw the sperms into the micropylar canal. Before fertilization of these studied fishes, there is physical movement which forces sperms into the mature eggs, besides the chemical substances secreted by the mature eggs and sperms.
On the basis of the law of individual variability, it is inferred that some kinds of fishes in the southern hemisphere pcrhapes have right whirlpool-like struturc of the micropyle, because there arc left whirlpool-like structures of the micropyle studied fishes in the northern hemisphere.
关键词
泥鳅
精子
卵
受精物理因素
Matured egg of Misgurnus anguillicaudatus, Micropylc, Fertilized physical factor
