Table 1.

The fate of spermatozoa that reached ZP surface

No. of spermatozoa (%)
SpermatozoaAcrosome-reacted before contact with ZPAcrosome-intact when first contacted with ZP
Entered the cumulus and reached ZP surface115214
Initiated the AR on ZP4 (1.9)
Penetrated through ZP57 (49.6)4 (1.9)
Developed to sperm pronucleus12 (10.4)1 (0.5)