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MATURATION ARREST A testicular condition in which at one stage of sperm production all sperm development halts throughout all testicular tubules. May result in oligospermia or azoospermia.

MEIOSIS The cell division, peculiar to reproductive cells, which allows genetic material to divide in half. Each new cell will contain twenty-three chromosomes. The spermatids (immature sperm) and ova (eggs) each contain twenty three chromosomes, so when they combine (fertilize), the baby will have a normal complement of forty-six.

MENORRHAGIA Heavy or prolonged menstrual flow.

METRODIN (PURE FSH) An injectable form of Follicle Stimulating Hormone used to stimulate ovulation.

METRORRHAGIA Menstrual spotting during the middle of the cycle.

MISCARRIAGE Spontaneous loss of an embryo or fetus from the womb.

MITOSIS The division of a cell into two identical cells in which all forty-six human chromosomes are duplicated; the first division of the germ cell.

MITTLESCHMERZ The discomfort felt on one side of the lower abdomen at the time of ovulation.

MYCOPLASMA See Ureaplasma.