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EMBRYO DEVELOPMENT -- UP TO BLASTOCYST

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Published on Nov 14, 2011

One day after fertilization, the embryos are observed under the microscope. If they have been fertilized a single cell with two nuclei (masculine and feminine) will be observed. Two days after the puncture of the embryo it will divide into two cells with one nucleus per cell; these, in turn, divide again, giving an embryo with four cells. Three days after the puncture, the embryo divides again and will have eight cells. On the fourth day, the embryo divides several times into a default form called a morula. Then it begins to compact. On day five the embryo continues to divide until it has more than 100 cells. A lagoon, filled with liquid, forms in the centre. Subsequently, the embryo is released from its surrounding membrane (hatchling).

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