Now, following sexual intercourse the sperm is deposited into the vaginal tract. It then travels into the uterus and it travels up into the fallopian tube. And eventually, it reaches and combines with the egg cell. And once this process takes place, known as fertilization we form the zygote. So as soon as we form that zygote that zygote begins to move along the cilia along the cilia of the fallopian tube and towards the uterine cavity. And eventually, as it moves along the fallopian tube it begins a process known as cleavage.