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the discharge of a secondary oocyte from the graafian follicle; in an adult woman this normally occurs at intervals of about 28 days and alternates between the two ovaries. As a rule, only one secondary oocyte is produced, but occasionally ovulation produces two or more; if more than one subsequently become fertilized, the result may be multiple births, such as twins or triplets. adj., adj ov´ulatory.

Ovulation takes place approximately at the midpoint of the menstrual cycle, 14 days after the onset of menstruation. During the preceding weeks, a graafian follicle (cell cluster in the ovary containing the oocyte) grows from the size of a pinhead to that of a pea. At the moment of ovulation, the follicle bursts open and the ovum is discharged.

The discharged ovum enters the fallopian tube adjoining the ovary and moves toward the uterus; if it encounters a spermatozoon while it is still alive (about 48 hours), the two merge and fertilization takes place, usually in the fallopian tube. The fertilized ovum then makes its way to the uterus, where it becomes embedded in the prepared wall as the first stage of growth of the fetus (see illustration, and see also reproduction). If fertilization does not take place the ovum loses its vitality and the blood and tissue lining the uterus are shed in the menstrual flow.
ovulation method cervical mucus method; see discussion under contraception.


(ov'yū-lā'shŭn, ō'vū-),
Release of an ovum from the ovarian follicle.


/ovu·la·tion/ (ov″u-la´shun) the discharge of a secondary oocyte from a graafian follicle.ov´ulatory


Etymology: L, ovum + atio, process
expulsion of an ovum from the ovary on spontaneous rupture of a mature follicle as a result of cyclic ovarian and pituitary endocrine function. It usually occurs on or about the eleventh to the fourteenth day before the next menstrual period and may cause brief, sharp lower abdominal pain on the side of the ovulating ovary. See also oogenesis. ovulate [ov′yə′lāt] , v.


Release of an oocyte from the ovarian follicle.


The release of an OVUM from a mature Graafian follicle in the OVARY. Ovulation occurs about half way between the beginning of consecutive menstrual periods, usually about 14 days before the expected date of onset of the next period.


the bursting of the OVARIAN FOLLICLE (See also GRAAFIAN FOLLICLE on the surface of the ovary with the release of an egg which then normally passes into the OVIDUCT.


The phase of the female monthly cycle when a developed egg is released from the ovary into the fallopian tube for possible fertilization.


the discharge of the ovum from the graafian follicle.
The discharged ovum enters the uterine tube adjoining the ovary and moves toward the uterus; if it encounters a spermatozoon while it is still alive (about 48 hours), the two merge. Fertilization usually takes place in the uterine tube. The fertilized ovum then makes its way to the uterus, where it becomes embedded in the prepared wall as the first stage of growth of the embryo. See also estrus, estrous cycle.

double ovulation
simultaneous ovulation in both ovaries.
ovulation failure
the ripe follicle does not rupture and discharge its ovum.
ovulation fossa
site of rupture of mature follicles.
multiple ovulation
noncopulatory ovulation
standard procedure in species other than cats.
quiet ovulation
see silent estrus.
ovulation tags
strands of fibrin, proliferating capillaries and leukocytes on the peritoneal serosa close to ovulation sites especially in mares and cows.

Patient discussion about ovulation

Q. i just have my period last november 25 and ended on 28.when is my possible fertile and ovulation period please help me identify my fertile and ovulation period

A. If someone knew it, it'd solve the human race many problems with fertility. The problem is that ovulation (and thus, the period of possible fertility) happens 14 days BEFORE the onset of menses, so you know about it only retrospectively.

However there ways such as serial body temperature measuring, along with kits that measures the level of hormones in the urine in order to estimate the time of the coming ovulation, and help in timing intercourse.

You may read more about it here (www.mayoclinic.com/health/ovulation-signs/AN01521 ) but anyway, consulting a doctor (e.g. gynecologist) may be wise.

More discussions about ovulation
References in periodicals archive ?
John was remembered in multiple tributes at this year's international conference of the World Organisation of the Ovulation Method Billings (WOOMB), held in Melbourne April 27-29, 2007, on the theme of "Culture and the family throughout history.
John Billings, major developer of the Billings Ovulation Method now used in 130 countries, states: "The facts are incontrovertible.
All the instructors take professional training that meets the World Organization of the Ovulation Method standards.
It may be that when the Guide recommends that "health associations and organizations promote the various methods of regulation of conception that respect a woman's natural fertility cycles," it intended to refer only to the natural family planning methods, such as the Creighton model, the Billings Ovulation method, or the Serena method.
Evelyn and John Billings in the verification of the reliability of the Billings Ovulation Method, the most widely used and successful method of natural family planning today.
Odeblad independently provided complete confirmation of the basic principles and guidelines of what we had called the Ovulation Method and which later came to be called the Billings Ovulation Method (BOM) or just the Billings Method.