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Menstruation: "mensis" from Latin meaning "month"

What Is The Luteal Phase?

Following the ovulation of an egg from the ovary,
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 endometrium (lining of the uterus)
to prepare for a blastocyst to implant.

If the blastocyst does not implant, progesterone levels drop and menstruation occurs.

Moon photo Courtesy NASA/JPL-Caltech

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