The multicellular descendant of the united sperm and ovum that implants on the wall of the uterus is known as the Blastocyst
- A normally developing embryo will have six to ten cells three days after fertilization.
- The fertilized egg is known as a blastocyst — a rapidly dividing ball of cells — by the fifth or sixth day. The embryo will be formed by the inner group of cells. The outer group will develop into the cells that feed and protect it.
- The blastocyst grows and develops within the womb lining during weeks 4 to 5 of early pregnancy. The outer cells extend their reach to connect with your blood supply. They will eventually form the placenta (afterbirth). The embryo develops from the inner group of cells.
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