• Fertilization process, the first days:
Fusion of a spermatozoon with an ovum at the moment of conception. Then the zygote first divides into two identical cells, called blastomeres. The cells keep dividing, about 3 days after conception, the zygote now consists of about 16 cells and is called a 16 cell morula. 5 days or so after conception a cavity appears in the center of the morula. The grouping of cells are now called a blastocyst. The blastocyst “hatches” out of the protective zona pellucida. This hatching allows increased growth, access to uterine nutrient secretions and blastocyst adhesion to the uterine lining. It has an inner group of cells which will become the fetus and later the newborn.
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