The function of the fimbriae is to produce a peritoneal fluid, which moves the egg to the uterus. The fimbriae come into use during ovulation.
According to Healthline, the fimbriae sit at the end of the Fallopian tubes and connect to the ovary. The fimbriae are very small in size and have finger-like appendages. The fimbriae dictate the movement of the ovum, and it takes approximately three to five days before the egg is moved completely to the uterus. It is at this point that the egg can be fertilized by sperm. If fertilization does not take place, the egg is removed from the body through menstruation.