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Human fertilization

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A basic information to lay people & school going children about Human fertilisation

A basic information to lay people & school going children about Human fertilisation

Published in Health & Medicine
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  • 1. Fertilization & Development 19 Nov. 2008 Fertilization.ppt
  • 2. Coitus & Sperm Transfer
    • 2-3 phases
      • Erection/engorgement: Parasympathetic reflex
      • Plateau
      • Orgasm: Sympathetic reflex
        • Heart rate, contractility increase (pulse & BP)
        • Intense pleasure
        • Ejaculation by male
    19 Nov. 2008 Fertilization.ppt
  • 3. Fertilization
    • Contact of sperm & secondary oocyte occurs in uterine tube
      • Sperm penetration
      • Oocyte completes meiosis II
      • Nuclear fusion
    19 Nov. 2008 Fertilization.ppt
  • 4. Fertilization
    • Sperm penetration
    • Why so many?
    19 Nov. 2008 Fertilization.ppt
  • 5. Fertilization
    • Oocyte completes meiosis II
    • Nuclear fusion
      • 1n + 1n  2n
    19 Nov. 2008 Fertilization.ppt
  • 6. Early Development
    • Cleavage in uterine tube
    19 Nov. 2008 Fertilization.ppt
  • 7. Early Development
    • Implantation
      • 6-7 days after fertilization
      • Trophoblast forms placenta
      • “ Inner cell mass” forms embryo
      • (pp. 1118-1119)
    19 Nov. 2008 Fertilization.ppt
  • 8. Early Development
    • Implantation
      • Trophoblast forms placenta
      • “ Inner cell mass” forms embryo
    19 Nov. 2008 Fertilization.ppt
  • 9. Early Development
    • Placenta
      • Provides large area for exchange of O 2 , CO 2 , nutrients, metabolic wastes between fetal and maternal blood
    19 Nov. 2008 Fertilization.ppt
  • 10. Pregnancy
    • Pregnancy lasts 39-40 weeks,
      • 280 days from last menstrual period
      • 3 trimesters
    • Hormonal changes
    19 Nov. 2008 Fertilization.ppt
  • 11. Labor & Delivery
    • Dilation
      • Cervix dilates to ~ 10 cm diameter
      • Effacement
      • Descent of fetus into birth canal (“Station”)
    • Expulsion
    • Placental stage
      • “ afterbirth”
    19 Nov. 2008 Fertilization.ppt