Immediately after of a sperm into the egg the latter shows a cortical reaction to check the entry of more sperms .
It this reaction the cortical granules present beneath the eggs plasma membrane release chemical substance between the ooplasm and the olasma membrane .
These substances raise the vitelline membrane above the egg surface .
The elevated vitelline membrane is called fertilization membrane .
The increased space between the ooplasm and the fertilization membrane and the chemical present in it effectively chech the entry of other sperm .
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