NATS 1610 Lecture Notes - Ovulation, Oviduct, Mitosis
Document Summary
Living body: pre embryonic period, ovulation and fertilization. Ovulation: a secondary oocyte is released and swept into the oviduct. Fertilization: a single sperm penetrates the secondary oocyte, eventually the sperm and egg nuclei will fuse, resulting in a fertilized egg, or zygote. In summary: (review slide 9 in lecture 23) Human females are born with 2 million plus follicles within ovaries but puberty, down about 200000 to 400000: only about 400 are released, 1 or a few per month, men continuously produce new sperm. Maturing follicles develop pools of fluid: follicle wall balloons on the surface of the ovary, ovulation occurs when follicle burst and releases egg. Egg is swept into oviduct- fallopian tube (by finger like projections called fimbriae. Oviducts have billowing folds on their inner, mucous coated surface (not that easy for sperm to find egg) Eggs only live between 6-24 hours without fertilization. Fertilization and zygote formation (normally occurs in oviduct)
