The corpus luteum is a gland in the follicle, the area of the ovary which houses the egg. It develops there temporarily before being released during ovulation. The corpus luteum is the transformation of the mature follicle after it has expelled the oocyte, and plays a hormonal role of progesterone secretion. If the egg is fertilized, it continues to produce progesterone during the first months of pregnancy, which allows the uterine lining to grow enough to accommodate implantation and allow the growth of the egg. If the egg is not fertilized, the corpus luteum disappears, which stops the production of progesterone and a period takes place, bleeding from the destruction of the endometrium by the absence of hormonal stimulation, a new corpus luteum will appear next cycle.
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. Translated by Jeff