About 2s after fertilization in 17 , sperms arrive at micropylar tube ; 3s , sperm penetrates into ovum where cytoplasm is sunken ; 5s , the spermaster come into being ; 20s , fertilization stopper appears ; 60s , sperms in micropylar apparatus begin to disaggregate 精子在受精2s到達(dá)精孔管, 3s進(jìn)入卵子, 5s形成精子星光, 20s形成受精塞, 60s后精孔器內(nèi)精子開始溶解。有多精入卵現(xiàn)象,極少數(shù)卵子多精受精。