KINESIOL 1YY3 Lecture Notes - Lecture 33: Peritoneum, Trophoblast, Fetus

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Starts at the first day of menses. Follicular phase denoted within ovary as development of follicle. End of menses rapid proliferation of endometrial lining. Luteal phase (or secretory phase) denoted by presence of corpus luteum. Follicle develop secrete estrogen rapidly inc toward end of follicular phase inc in lh primary oocyte finish first meiotic division & ovulation. During proliferative inc in thickness of endometrial layer (due to estrogen. Follicle becomes corpus luteum conc being released) Allows follicle to rupture and oocyte released in the peritoneum. Hcg secreted from trophoblast then from placenta. Very quick at the start of pregnancy. Progesterone go up in the first trimester, maintained, then inc at the end. Estrogen secreted from placenta and corpus luteum for first and second trimester. From the corpus luteum in the last trimester. Dichorionic twin has their own placenta. Diamniotic have their own amniotic sac. Identical split happens 1-4 days after fertilization develop just as fraternal twins (own sac and placenta)

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