The fallopian tubes have an important role in ensuring reproductive function. Once ovulation has occurred, fimbria finds the egg in the peritoneal fluid and moves it to the ampulla of the fallopian tube. Sperm moves through the cervix, uterus and enters the fallopian tubes, wherein the ampulla fertilization takes place. Cell division begins and the embryo moves back to the uterine cavity, traveling 96 to 120 hours and ending up in the blastocyst stage.