1. Chapter 3
Prenatal Development

2. Fertilization
Takes place in the outer third of the fallopian tube, near the ovary B
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3. Fertilization B
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4. Three Stages of Prenatal Development
Zygote: cell formed by union of sperm and ovum
Embryo: 2nd to 8th week of development
Fetus: 9th week until birth B
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5. Embryo at 3 weeks, 4 weeks, 8 weeks
Prenatal Development
Embryo at 3 weeks, 4 weeks, 8 weeks B
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6. Prenatal development B
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7. Placenta Organ for fetal respiration, nutrition, and excretion
Produces four hormones
Progesterone
Estrogen
Human chorionic gonadotropin (hCG)
Human placental lactogen (hPL) B
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8. Maternal-fetal circulationB
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9. Fetal Shunts
Foramen ovale
Ductus arteriosus
Ductus venosus B
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10. Changes in circulation after birth
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11. Multifetal pregnancy B
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