A woman's two fallopian tubes lead upward from each upper side of
the uterus and end near the ovaries. When an egg is released by an ovary
(ovulation), it travels down a fallopian tube toward the uterus.
After ovulation, egg fertilization usually happens in a fallopian
tube. The fertilized egg then travels to the uterus, where it implants and
grows. If a woman's fallopian tubes are blocked by scar tissue, such as from
pelvic inflammatory disease, she may be unable to become pregnant or may have a
tubal (ectopic) pregnancy.