fertilization. penetration sperm cell of the egg

acrosomal acrosome anatomy axoneme block cell cells cellular conception contraception corona cortical diagram education egg fecundation female fertile fertility fertilization follicle fusion gametes genetic germ granules gynecology health human illustration implantation impregnation infertility male medical medicine membrane membranes nucleus obstetrics oocyte ovulation ovum pellucida perivitelline plasma polyspermy pregnancy pregnant pronucleus radiata reaction reproduction reproductive research science sex slow space sperm spermatozoid spermatozoon structure system uterus vector vitelline woman zona zygote