When the ovum or egg is released from the ovary, it is picked up by Fallopian tube through which it moves into the uterus. If sperms are present in the Fallopian tubes, the ovum is fertilized and the resulting embryo is transmitted to the uterus and baby forms. In Tubectomy the tubes are blocked or divided to prevent the eggs from entering the uterus. This prevents any future pregnancies to occur after the surgical procedure. But however during menstruation the ovum has to be taken to uterus and then shed out.. how this happens?