Sperm reception by an egg microvillus in the polychaete, Tylorrhynchus heterochaetus
Sperm reception by an egg microvillus in the polychaete, Tylorrhynchus heterochaetus
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多毛类动物（Tylorthronchusheterochaetus）卵微绒毛对精子的接收
DOI：
10.1002/jez.1402270315
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发表时间：
1983
影响因子：
--
通讯作者：
K. Osanai
中科院分区：
文献类型：
--
作者：
Masanori Sato;K. Osanai
对多毛类动物 Tylorhynchus heterochaetus 正常受精过程中的精卵相互作用进行了精细结构研究。精子在绒毛膜最外层引发顶体反应，绒毛膜由四层组成。顶体小泡打开后，顶体下间隙扩大成为小叶状顶体突，其额缘穿透第一、二层绒毛膜并与第三层粘连。该过程没有穿透第三层和第四层。授精后 1 分钟内，受精精子的顶体过程与从卵子穿过绒毛膜伸出的微绒毛融合。微绒毛增厚并发育成精子穿透锥。受精后 20-25 分钟，精子核通过该锥体进入卵子皮质。结果表明，卵子微绒毛的尖端是精子接收的部位。
A fine-structure study of sperm-egg interactions during normal fertilization in the polychaete Tylorrhynchus heterochaetus was carried out. Sperm initiated an acrosome reaction on the outermost layer of the chorion, which consisted of four layers. After the acrosomal vesicle opened, the subacrosomal space expanded to become a lobular acrosomal process, the frontal margin of which penetrated the first and second layers of the chorion and adhered to the third layer. The process did not penetrate the third and fourth layers. Within 1 min of insemination the acrosomal process of the fertilizing spermatozoon fused with a microvillus projecting from the egg through the chorion. The microvillus thickened and developed into a sperm penetration cone. The sperm nucleus entered the egg cortex through this cone 20–25 min after insemination. The result shows that the tips of egg microvilli are sites for sperm reception.