02_Embryology

02_Embryology - EMBRYOLOGY Chapter 3 Week One Weeks 5-8...

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EMBRYOLOGY Chapter 3 Week One Weeks 5-8 Weeks 9-12 Weeks 13-16 Weeks 17-20 Weeks 21-38
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Prenatal Period First 38 weeks of human development Pre-embryonic period Weeks 1-2 Embryonic period Weeks 3-8 Fetal period Weeks 9-38
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PRE-EMBRYONIC PERIOD - Weeks 1-2
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Inner Cell Mass (ICM) or Embryoblast Becomes the embryo Trophoblast Becomes the fetal half of placenta A Closer Look at the Blastocyst
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The trophoblast divides into two layers: Cytotrophoblast: Inner layer Syncytiotrophoblast: Outer layer These layers form the chorion , which creates the fetal part of the placenta The Trophoblast
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Forming the Bilaminar Disc Inner Cell Mass Divides into two sheets of cells: epiblast and hypoblast Together these two form a flat disc referred to as the bilaminar germinal disc Epiblast forms the: Embryo Amnion Hypoblast forms the: Yolk sac
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EMBRYONIC PERIOD Weeks 3-8 Formation of Three Germ Layers Primitive streak appears on dorsal surface of epiblast Primitive Streak Epiblast Hypoblast
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Gastrulation- epiblast cells invaginate through the primitive streak towards the hypoblast Cells that invaginate form the mesoderm and the endoderm
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This note was uploaded on 04/06/2011 for the course PDBIO 220 taught by Professor Tomco during the Winter '09 term at BYU.

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02_Embryology - EMBRYOLOGY Chapter 3 Week One Weeks 5-8...

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