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Ovulation is the process in the menstrual cycle by which a mature ovarian follicle ruptures and discharges an ovum (also known as an oocyte, female gamete, or casually, an egg) that participates in reproduction. Ovulation also occurs in the estrous cycle of animals, which differs in many fundamental ways to the menstrual cycle.

Note: This article deals primarily with human ovulation; nonhuman animal ovulation is touched on briefly at the conclusion.

Overview


In humans, the period when ovulation occurs is called the ovulatory phase, and it occupies the fourteenth day of an idealized twenty-eight day menstrual cycle. Because of the variable nature of the menstrual cycle in vivo, however, normal ovulation can occur as early as day 8 or as late as day 20 and beyond. A woman with a particularly short cycle will ovulate earlier while a woman with a long cycle will ovulate later. In humans, concealed ovulation means that the female shows few visible signs of being fertile, compared to most species. There are evolutionary analyses of how this could evolve in terms of evolutionary game theory.

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Pinoyhealthcare (Thomas Jefferson) Tue, 03 Nov 2009 23:29:17 -0000
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