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The embryo becomes established in its new place. First it settles into the mucous membrane of the uterus and then the placenta is formed.
The placenta is the organ connecting the fetus to the uterine lining.
Its function is to supply food and oxygen to the fetus while removing waste materials.
A disk forms in the center of the embryo. The embryo is 14 days old and still the size of the head of a pin.
The disk thickens. It is centered between two pockets of fluid and ready to begin building the body's systems.
The nervous system comes first. A deep groove forms along the back. It folds inward to create a tube that will later become the spinal cord. The two large balls will eventually become the brain hemispheres.
The embryo begins to curve inward. The heart and blood vessels begin to form the foundation of the vascular system.
As it develops, the embryo goes through all the evolutionary stages. First it is like a fish, then like a reptile. It will take weeks before it assumes human form.
Within 20 days, the embryo has developed from one cell into a sophisticated system with perfectly synchronized cells. This tiny organism is its own genius architect.