So inside the fallopian tube, the cells that line the fallopian tube contains cilia and the wavelike motion of the cilia allows the movement of that oocide along the fallopian tube. In addition, the peristalsis, the contraction of the muscle along the fallopian tube also allows the movement of that oicide along that canal and to the uterus. Now let's suppose that this particular individual undergoes sexual intercourse so that sperm cells are deposited into the vaginal cavity. From the vaginal cavity those sperm cells move into the uterus and eventually make their way into the fallopian tube. And at this portion, at the thickest portion of the fallopian tube a single sperm cell will combine with this secondary OSI. And this is the process of fertilization.