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Embryonic development, Nadia Nallely Valencia Vázquez - Coggle Diagram
Embryonic development
There is a rapid development of the embryo from the ttrilaminar embryonic disc during the third week and is characterized by:
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The first morphological sign of gastrulation is the formation of the primitive streak, on the surface of the epiblast of the bilaminar embryonic disc. It is the result of the proliferation and movement of the epiblast cells towards the median plane of the embryonic disc.
Shortly after the appearance of the primitive line, the cells leave their deep surface and take on the appearance of mesenchyme, an embryonic connective tissue formed by small spindle cells that are arranged with a low cell density in an extracellular matrix in which also there is a low number of collagen fibers.
The mesenchyme forms the supporting tissues of the embryo, such as the majority of the body's connective tissues and the connective tissue interweaving of the glands.
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Gastrulation is the formative process by which the three germ layers are formed in the embryo, which are the precursors of all embryonic tissues, establishing the axial orientation.
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Gastrulation represents the beginning of morphogenesis. Throughout this period the embry may be called a gastrula.
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