Ovum

An ovum (plural: 'ova'), also called an egg, is a female sex cell; these are located in the ovaries. The female, unlike the male, does not manufacture the sex cells throughout her life. A girl baby is born with about 60,000 of these cells, which are contained in sac-like depressions in the ovaries. Each of these cells may have the potential to mature for fertilization, but in actuality only about 400 ripen during the woman's lifetime.