This medical illustration shows the route of the egg through the fallopian tube to the uterus during implantation. The egg starts in the ovary, passes into and through the fallopian tube, then into the uterus. There, it comes to rest in the lining of the uterus, called the endometrium. If the egg is not fertilized, it will degenerate and pass out of the uterus through the vagina during menstruation.