Hormones and the menstrual cycle Animation




Feedback loops to the hypothalamus and pituitary gland from the ovaries during the menstrual cycle Animation for a step-by-step explanation. Production of a releasing hormone (GnRH) by the hypothalamus prods the pituitary's anterior lobe to release FSH and LH. In the ovary, FSH and LH stimulate egg maturation and estrogen production. High estrogen levels trigger a surge in LH, which brings about the release of an egg, and formation of the corpus luteum. This glandular structure releases progesterone and estrogen. During the last phase of the cycle, the rising blood levels of progesterone and estrogen feed back to the hypothalamus and pituitary to inhibit secretion of LH and FSH.



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