1. sperm reaches the ovum
2. chemicals released from the cells surronding the ovum triggerring the acrosome reaction.
3. the acrosome swells, fusing with the sperm cell surface membrane.
4. digestive enzymes in the
5. the enzymes digest through the follicle cells and the jelly like layer surrounding the ovum
6. the sperm fuses with the ovum membrane
7. the sperm nucleus enters the ovum
8. enymes released from lysosomes in the ovum thicken the zona pellucida preventing entry from other sperm
9. nuclei of the ovum and sperm fuse
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