NURS 3550H Lecture Notes - Lecture 6: Corpus Luteum, Anterior Pituitary, Follicular Phase
28 Dec 2018
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Document Summary
In the ovary, the following sequence occurs: several ovarian follicles ripen, one of the ripe follicles ruptures causing ovulation the ruptured follicle evolves into a corpus luteum if fertilization does not occur, the corpus luteum atrophies. The uterine changes that occur during the cycle stated above is all brought on by estrogen and progesterone. During the first half estrogens are released by maturing ovarian follicles. These estrogens act on the uterus to cause proliferation of the endometrium. For the second half estrogens and progesterone are produced by the newly formed corpus luteum. These hormones maintain the endometrium in its hypertrophied state. When the corpus luteum atrophies it causes estrogen and progesterone levels to dec causing endometrium to break down. The two anterior pituitary hormones are follicle-stimulating hormone (fsh) and luteinizing hormone (lh) First half of the cycle fsh acts on the developing ovarian follicles which causes them to mature and secrete estrogens.
