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Menstruation: "mensis" from Latin meaning "month"
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What Is The Luteal Phase?
Following ovulation—when an egg floats from the ovary into a fallopian tube—the follicle which surrounded that egg is not finished with its work.
Now it becomes the corpus luteum, a group of cells, capillaries
and connective tissue with a life span of about 14 days.
During those 14 days, the corpus luteum triggers the production of
the hormone progesterone, stimulating the lining of the uterus (or endometrium) to prepare for a blastocyst to implant and begin growing.
If a blastocyst does not implant, progesterone levels drop and menstruation begins.
Moon photo Courtesy NASA/JPL-Caltech
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