IUB MSCI-M 131 - Female Reproductive System (11 pages)

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MSCI 131 Diseases and the Human Body Lecture 2 Outline of Last Lecture I Male Reproductive System Current Lecture Female Reproductive System I Ovaries until the 6th week of pregnancy the sex organs in both sexes are bipotential the sex organ present in the embryo may become either a testis or ovary During the 7 th week of pregnancy the organ develops testis determining factor TDF on the Y chromosome influences maleness and one or more female determining genes influence femaleness The ovaries descend to their normal position by the 12 th week and attach to the uterus a Structure ovaries held in place by attachment to the uterus Ovarian Ligament and to the pelvic wall suspensory Ligament Internally in the newborn the outer portion of the ovary cortex contains several hundred thousand oogonia cells that develop into eggs these are the only ones during whole lifetime no new develop I Each oogonium is surrounded by a population of protective and nourishing cells granulosa cells Prior to birth some oogonia increase in size and become primary oocytes will lie dormant until puberty II Oogenesis sequence of events leading to the development of egg cell Two hormones responsible released from brain every 28 days average 1 Follicle stimulating hormone FSH responsible for increasing of granulosa cells 2 Luteinizing hormone causes primary oocyte to divide into secondary oocyte and a polar body which degenerates and causes release of secondary oocyte ovulation a After secondary oocyte is released LH causes the corpus luteum to develop produces estrogen and progesterone hormones that prepare the uterus for secondary oocyte implantation after fertilization estrogen also causes development of secondary sex characteristics a Contraception These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute II Birth control pills usually contain mestranol synthetic form of estrogen and either