The Fallopian tubes are tubes within the female body which play an important role in human reproduction. The ovum passes from the ovary to the uterus, by being gently swept along by cilia in the Fallopian tubes. The tubes are 10–13 cm (4–5 inches) long and 0.5–1.2 cm (0.2–0.6 inch) in diameter. [1] Ectopic pregnancies, where the unborn child develops outside of the uterus, most commonly occur within the fallopian tubes.