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April 16, 2012 - page 9 / 70

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The Embyronic Period (cont)

Yolk sac

first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation

Placenta

Develops at the site of implantation

Secretes human chorionic gonadotropin (hCG)

Effect on ovaries

Effect on corpus luteum

Nourishment, oxygen, elimination of waste products

Umbilical cord

Connects the developing embryo of fetus to the placenta

Waste products are removed from the fetus and nutrients are transported from the mother through the placenta

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