What is cortical diffusion ??please explain

Dear student 
Cortical diffusion takes place in the (female gamete) egg of mammals and some other organisms. This process is initiated during fertilisation and is marked by release of cortical granules of the egg which inhibit entry of more than one sperm in the egg. Thus, preventing polyspermy. After the entry of one sperm,the cortical granules fuse with zona pellucida layer of egg, making it hard and impermeable to rest of the sperms.
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