Titlebook: Embryogenesis; H. Tuchmann-Duplessis,G. David,P. Haegel Textbook 1971 Springer Science+Business Media New York 1971 development.embryo.emb

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Mit Erfolg zur Professur oder DozenturDespite its short duration, the embryonic period is of fundamental importance, as the embryo acquires its almost definitive form . and builds the main outlines of its organs .. During the long fetal period which follows, the organs undergo little more than maturation at the histological level ..

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First Week of Development,The fertilized ovum, through cleavage, reaches the . stage. Then, forming a central cavity, it becomes a ., which implants itself in the uterine mucosa on the 6th day.

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Second Week: Formation of the Embryonic Disc,At the end of the first week, the blastocyst is in the embryoblast stage (fig. 1). During the second week, the . (fig. 1), then the . (fig. 3) are differentiated successively from the lower part of this cellular mass, while the egg buries itself in the uterine mucosa (fig. 2).

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Third Week: Gastrulation,At the beginning of the 3rd week, an important process occurs: ., the formation of the third layer of the embryo, the ..

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Destiny of the Three Germ Layers,At the end of gastrulation, the three germ layers are in place.