menstruation

menstruation /men·stru·a·tion/ (men?stroo-a´shun) the cyclic, physiologic discharge through the vagina of blood and muscosal tissues from the nonpregnant uterus; it is under hormonal control and normally recurs usually at approximately four-week intervals, except during pregnancy and lactation, throughout the reproductive period (puberty through menopause).

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anovular menstruation , anovulatory menstruation periodic uterine bleeding without preceding ovulation.

infrequent menstruation  oligomenorrhea.

profuse menstruation  hypermenorrhea.

retrograde menstruation  backflow of menstrual fluid, epithelial cells ,and debris through the uterine tubes and into the peritoneal cavity.

scanty menstruation  hypomenorrhea.

vicarious menstruation  discharge of blood from an extragenital source at the time menstruation is normally expected.

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men·stru·a·tion (mnstr-shn)

n.

The process or an instance of discharging the menses.

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menstruation

(men´strooā´shn),
n the normal shedding of the necrotic mucosa of the endometrium and associated bleeding that occurs in the final phase of the menstrual cycle. The average duration of menstruation is 5 days, in which approximately 30 ml of blood is lost.