ovulation

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Related to Periovulatory: Ovulatory period

ovulation

 [ov″u-la´shun]
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.
ovulation method cervical mucus method; see discussion under contraception.

ov·u·la·tion

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

ovulation

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

ovulation

[ov′yəlā′shən]
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.

o·vu·la·tion

(ov'yū-lā'shŭn)
Release of an oocyte from the ovarian follicle.

ovulation

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.

ovulation

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.

Ovulation

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

ovulation

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 ?
The current study examined whether there is an ovulatory shift in women's body image similar to the ovulatory shift reported for feelings of physical attractiveness by Haselton and Gangestad (2006), and also whether there are mood changes, either positive or negative, across the periovulatory and luteal phases.
Periovulatory gonadotrophin and ovarian steroid patterns in sheep of breeds with differing fecundity.
Expression and localization of PPARs in the rat ovary during follicular development and the periovulatory period.
To evaluate the expression of Cx26, Cx32, Cx37 and Cx43 during the periovulatory period, ovaries were collected from ewes (n = 5-7/group) injected twice daily with follicle stimulating hormone (FSH) on days 13 and 14 of the estrous cycle, and with FSH and human chorionic gonadotropin (hCG; ovulatory dose) on the morning of day 15 of the estrous cycle.
Changes in the plasma concentration of luteinizing hormone, progesterone and estradiol -17p during the periovulatory period in cyclic swamp buffaloes (Bubalus bubalis).
For the estrogen metabolite, the maximum value was selected within a 6-day window around the day of ovulation to capture the periovulatory peak.
Comparisons of endocrinology and behavioural events during the periovulatory period in meshian and large-white hybrid gilts.
Further, no report is available on evaluating the interrelationships of hormones (progesterone, estradiol and LH) during the critical periovulatory period in Heatsynch protocol even in cows.
Urinary hormone metabolite profiles were characterized by a gradual rise and abrupt fall of E1C (Figure 1A), with a single, prominent periovulatory FSH peak on approximately day 14 (shorter length cycles) or day 22 (longer cycles) after the onset of menstruation.
Patterns of Circulating Gonadotropins and Ovarian Steroids during the first periovulatory period in the developing sheep, Biol.
We hypothesize that the intricate connections between equal gender proportions and optimal conceptions at the core of the fertile window of the menstrual cycle and between disproportionate rates of male-biased and pathologic conceptuses outside of it are due to periovulatory hormone modulation, which simultaneously affects cervical liquefaction and oocyte maturation (8,9).