NSE 31A/B Lecture Notes - Lecture 5: Varicose Veins, Thyroid Hormones, Hypotension
8 Dec 2016
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Menstruation & fertility: avg age of menarche (1st period) = 12-15y/o. Regularity, duration: avg age of menopause (complete cessation of menstrual bleeding, at least 12mths) = 52y/o. Pre/post-menopause does not eliminate potential for fertility: first day of menstrual period (lmp) = defined by first day of full menstrual bleeding. Avg length of menstrual cycle = 28 days. Optimal fertility (ovulation) occurs ~ day 14 (end of 2nd week, beginning of 3rd week -- ~middle of cycle includes 1st day of. Lmp until last day before you start bleeding) Figuring this cycle out was first form of birth control [avoiding these certain days(ovulation) you are less likely to get pregnant] Conception (fertilization) & implantation [at this stage=blastocyst: after ovulation, egg travels down fallopian tube, sperm must be present w/in 12-24hrs of ovulation for fertilization, fertilization usually occurs in the tube, cellular division begins within 24hrs of fertilization. Implantation of the fertilized ovum into the uterine lining occurs 6-12 days after ovulation.
