Conversation so far:
what are the main parts of the female reproductive system
The female reproductive system includes the ovaries, fallopian tubes, uterus, vagina, vulva, mammary glands and breasts.
where does fertilization occur in the female reproductive system
The ovaries produce the egg cells, called the ova or oocytes. The oocytes are then transported to the fallopian tube where fertilization by a sperm may occur.

Question: what happens to the cells
Self-contained rewrite: what happens to the unfertilized ova