chap 14 notes

chap 14 notes - Chapter 14 Extraembryonic Membranes (Fig...

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Chapter 14 Extraembryonic Membranes (Fig 50-13) KEY CONCEPTS Extraembryonic membranes (amnion, chorion, allantois, and yolk sac) have evolved in terrestrial vertebrates as adaptations to reproduction on land Learning Objective 11 Describe the general course of early human development, including fertilization, the fates of the trophoblast and inner cell mass, implantation, and the role of the placenta Early Human Development Fertilization occurs in the oviduct Within 24hr zygote has divided into a two- celled embryo Cleavage takes place as embryo is moved down the oviduct Cells arrange themselves Blastocyst develops in the uterus Cleavage in Humans (Fig 50-14) Blastocyst Outer trophoblast layer gives rise to chorion and amnion that surrounds the embryo Inner cell mass becomes the embryo proper On 7 th day of development, blastocyst undergoes implantation Enzymes embeds it deep into the endometrium The Placenta Organ of exchange
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chap 14 notes - Chapter 14 Extraembryonic Membranes (Fig...

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