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Ovulation

Around day fourteen, the egg is released from the ovary. Called ovulation, this occurs when a mature egg is released from the ovarian follicles into the pelvic cavity and enters the fallopian tube, about 10–12 hours after the peak in LH surge. Typically only one of the 15–20 stimulated follicles reaches full maturity, and just one egg is released. Ovulation only occurs in around 10% of cycles during the first two years following menarche, and by the age of 40–50, the number of ovarian follicles is depleted. LH initiates ovulation at around day 14 and stimulates the formation of the corpus luteum. Following further stimulation by LH, the corpus luteum produces and releases estrogen, progesterone, relaxin (which relaxes the uterus by inhibiting contractions of the myometrium), and inhibin (which inhibits further secretion of FSH).