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Figure 28.9 Germ Layers
Formation of the three primary germ layers occurs during the first 2 weeks of development. The embryo at this stage is only a few millimeters in length. Illustration from Anatomy & Physiology, Connexions Web site. Embryonic Development
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This image shows the different germ layers. The top panel shows the epiblast and trophoblast cells in the early stages of development. The bottom panel shows the three germ layers: the endoderm, ectoderm, and mesoderm. All the other major parts are also labeled.
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