The development and release of an ovum (egg) from a follicle within an ovary. During the 1st half of the menstrual cycle, follicle-stimulating hormone (FSH) causes several ova to mature in the ovary. At mid-cycle, luteinizing hormone (LH) causes 1 ripe ovum to be released. Signs of ovulation include a rise in body temperature, changes in the cervical mucus, and sometimes mild abdominal pain (see mittelschmerz). A yellow mass of tissue called the corpus luteum, which forms from the follicle after ovulation, releases progesterone during the 2nd half of the cycle. After its release, the ovum travels along the fallopian tube and, if fertilization does not occur, is shed during menstruation. Regular menstruation usually means that ovulation is occurring, except around puberty and approaching the menopause.


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