A mature egg cell

For conception to take place, a mature egg cell, or ovum, must be at the right place at the right time. Conception takes place when a sperm penetrates the egg cell and fertilizes it, and the two cells combine to form a new life. Let's take a quick look at some of a woman's key reproductive organs and see how they function during menstruation and ovulation, two processes that are critical in preparing her for conception. You can see a cut-away view of one of the ovaries on the right. The purple structures inside the ovary are immature egg cells, or oocytes. All of the , egg cells a woman will ever produce are already present in her ovaries when she is born, although the eggs are in an undeveloped form.
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Normal Ovarian Function

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Oocyte Development During the Reproductive Cycle

Ovulation , release of a mature egg from the female ovary; the release enables the egg to be fertilized by the male sperm cells. Normally, in humans , only one egg is released at one time; occasionally, two or more erupt during the menstrual cycle. The egg erupts from the ovary on the 14th to 16th day of the approximately day menstrual cycle. If not fertilized, the egg is passed from the reproductive tract during menstrual bleeding, which starts about two weeks after ovulation. Occasionally, cycles occur in which an egg is not released; these are called anovulatory cycles. Prior to eruption from the ovary, an egg first must grow and mature.
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Key to Making Egg Cells Mature Found, Researchers Say

The egg cell , or ovum plural ova , is the female reproductive cell, or gamete , in most anisogamous organisms organisms that reproduce sexually with a larger, "female" gamete and a smaller, "male" one. The term is used when the female gamete is not capable of movement non- motile. If the male gamete sperm is capable of movement, the type of sexual reproduction is also classified as oogamous. When egg and sperm fuse during fertilisation , a diploid cell the zygote is formed, which rapidly grows into a new organism.
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An oocyte is an immature egg an immature ovum. Oocytes develop to maturity from within a follicle. These follicles are found in the outside layer of the ovaries.
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