Chapter 3 Prenatal Development.

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Copyright © 2012, 2008 by Saunders, an imprint of Elsevier Inc.
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Presentation transcript:

Chapter 3 Prenatal Development

Fertilization Takes place in the outer third of the fallopian tube, near the ovary B Menu F

Fertilization B Menu F

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 Menu F

Embryo at 3 weeks, 4 weeks, 8 weeks Prenatal Development Embryo at 3 weeks, 4 weeks, 8 weeks B Menu F

Prenatal development B Menu F

Placenta Organ for fetal respiration, nutrition, and excretion Produces four hormones Progesterone Estrogen Human chorionic gonadotropin (hCG) Human placental lactogen (hPL) B Menu F

Maternal-fetal circulation B Menu F

Fetal Shunts Foramen ovale Ductus arteriosus Ductus venosus B Menu F

Changes in circulation after birth Menu F

Multifetal pregnancy B Menu

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