Definition: Fertilization occurs when the sperm and egg combine to create an embryo.
Fertilization typically occurs in the fallopian tubes of a woman shortly after ovulation if sperm has been deposited into the reproductive tract. The fertilized egg then moves down the tube and implants into the uterus, initiating a pregnancy.
Occasionally the fertilized egg will implant outside of the uterus, such as in the fallopian tube or cervix, which is known as an ectopic pregnancy.
