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Conception and Fetal Development

Conception and Fetal Development. Chapter 4. Conception. Components of fertility Male and female Menstrual Cycle Hormonal Ovarian Endometrial. Hormonal Function. Function of hormones FSH LH Progesterone Testosterone. Cellular Division. Mitosis cellular division for healing

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Conception and Fetal Development

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  1. Conception and Fetal Development Chapter 4

  2. Conception Components of fertility • Male and female • Menstrual Cycle • Hormonal • Ovarian • Endometrial

  3. Hormonal Function • Function of hormones • FSH • LH • Progesterone • Testosterone

  4. Cellular Division • Mitosis cellular division for healing • Meiosis cellular division r/t reproduction • Oogenesis • Spermatogenesis

  5. Fertilization • Viability of ova vs. sperm • Fertilization occurs in distal 1/3 of tube • Embryonic development occurs immediately • HCG stimulates corpus luteum to secrete progesterone

  6. Implantation • Occurs 7 days after fertilization • Implants near fundus • Chorionic villae implant into endometrium which becomes decidua • Placental formation begins • Outer layer of chorionic villae become membranes- chorion and amnion

  7. Placenta • Structure: cotyledons, circulation • Functions • Fetal respiration, nutrition, excretion • Transport of passive immunity (IGG) • Stores glycogen and iron • Produces HCG, progesterone, estrogen, HPL • Suppresses maternal immune response

  8. Umbilical Cord and Amniotic Fluid • Umbilical Cord One vein-two arteries • Wharton’s jelly • Amniotic fluid • Volume changes • Diagnostic • Alkaline

  9. Fetal Circulation • Maternal blood carries oxygen disposes of waste • Fetal Hgb greater affinity for 02 • Vein transports 02 • Purpose of foramen ovale and ductus is to bypass non-functional fetal organs

  10. Human Development • Pre-embryonic-first 21 days • Embryonic-21days-9 wks • Most susceptible to teratogens • Period of differentiation • Fetal 9-40 weeks • Period of continued development

  11. What parents want to know? • 4-12 wks- All body parts formed, heart beating • 16 wks- Sex can be determined • 20 wks- Lanugo, vernix, hair, movement, favorite position, sleep-awake pattern, suck, grasp • 24 wks- Respiratory movements

  12. Development Milestones • 28 wks- eyes open, breathe, surfactant developing, 2/3 of birth weight • 32 wks- active period, gaining weight • 35-36 wks- surfactant will prevent alveoli collapse • 38-40 wks- passive immunity (IGG) received from mom

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