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Third Week of Development: Embryology
In the third week of embryonic development, the most significant event is the formation of the trilaminar germ disc through a process called gastrulation. This complex mechanism transforms the bilaminar disc into a structure composed of three primary germ layers: the ectoderm, mesoderm, and endoderm. 🌱✨ Gastrulation begins with the formation of the primitive streak on the surface of the epiblast, which is followed by the invagination of epiblast cells. These cells then migrate and differentiate to form the three distinct germ layers. The ectoderm gives rise to the nervous system and skin, the mesoderm forms the muscles, bones, and cardiovascular system, while the endoderm develops into the gastrointestinal tract and other internal organs. This period is crucial for laying down the foundational structures of the future organism, and any disruptions can lead to significant developmental abnormalities. 🚼🔍
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