Noun
English Wikipedia has an article on:zona pellucidaWikipedia
zona pellucida (plural zonae pellucidae or zonæ pellucidæ)
(anatomy) A glycoprotein membrane surrounding the plasma membrane of an oocyte.
After the sperm penetrates the zona pellucida, part of the sperm's cell membrane then fuses with the egg cell's membrane, and the contents of the head diffuse into the egg. Source: Internet
After the acrosome reaction, the sperm is believed to remain bound to the zona pellucida through exposed ZP2 receptors. Source: Internet
In order to prevent polyspermy and minimise the possibility of producing a triploid zygote, several changes to the egg's zona pellucida renders them impenetrable shortly after the first sperm enters the egg. Source: Internet
In 24 to 48 hours, the zona pellucida breaches. Source: Internet
The fertilized egg, if it doesn't reach the uterus in time, will hatch from the non-adhesive zona pellucida and implant itself inside the fallopian tube, thus causing the pregnancy. Source: Internet
ZP3, one of the proteins that make up the zona pellucida, then binds to a partner molecule on the sperm. Source: Internet