Embryonic Plate: Weeks 2-3
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Embryoblast (bilaminar disk)
Trophoblast (Placenta)
Week Three
Gastrulation
-establishes three germ layers: ectoderm, mesoderm, endoderm (trilaminar disk by day 21); give rise to all tissues and organs
-primitive streak first indication
-all derived from epiblast
Category: Anatomy Notes
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