Third Week of Development

Third Week of Development PPT Summary

1. The Gastrulation Process establishes the three germ layers—ectoderm, mesoderm, and endoderm—through the formation of the primitive streak on the epiblast surface.
2. The primitive streak becomes a visible groove, and the cephalic end forms the primitive node, which initiates cell migration and invagination for layer differentiation.
3. The inward movement of epiblast cells through the primitive streak forms the endoderm, mesoderm, and ectoderm, each contributing to different parts of the embryo.
4. Prenotochordal cells form the notochord, a structure essential for the axial skeleton and neural tube development.
5. The ectoderm forms skin and nervous tissues, the mesoderm forms muscles and bones, and the endoderm forms internal organs like the liver and gastrointestinal tract.

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