An infant's umbilical cord that is connected to the mother is very resilient and elastic and has blood vessels running inside it. The placenta begins to form in around the fifth week after conception and is fully grown by the 13th week.
The process begins when the fertilised egg implants itself on the inner wall of the uterus. Then, countless tiny hair (villi) sprout from the surface of the fertilised egg, and those on the side of the uterine wall begin to grow. This binds the egg to the wall, forming a flat cake shape.
This is Placenta.
Reference: http://www.zell-v.com/
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