At time of sexual intercourse, the male discharges at one ejaculation about 300 million (50 M. to 500 M.) into the vagina and they start to travel looking toward the secondary oocyte which is located in the uterine tube by their tails, and when they reach the Fallopian tube. Do the cilia of the uterine tube push the sperms toward the secondary oocyte or they make the way of the sperms difficult?
As I know, when sperms reache the first part of the fallopian tube (isthmus), they will wait for the secondary oocytes to reach close to the sperms by the help of fallopian tube cilia.