Fetal Development

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itself to the endometrium. The eighth day is when
implantation occurs. The fertilized egg then implants
itself on the endometrium, the uterine lining, and begins to
grow. The cell begins to grow and develop. By the 12th
day the blastocyst has approximately two thousand cells in
it. It has had time to attach itself to the endometrium and
these anchors are called protuberances.
Embryonic Development
After about three weeks the tiny little heart is
developed enough to start beating and has the ability to
pump blood. At this time the blastocysts becomes an embryo.
There are three layers that form the embryo. These layers
are called the germ or cell layers. The outer cell layer
will eventually become the backbone, the brain, and the
nerves. This layer also makes the skin, the hair, and
sebaceous and sweat glands.
The middle layer is going to be the lower layer of
skin, the bones, and the muscles. Blood and lymph vessels
are also made ...

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as well as the legs are very short. This
is because the embryo grows from the head down to the toes.
That means the head is going to be huge compared to the rest
of the body.
After six weeks from the LMP the embryo's backbone has
come together and there are two arteries that run down each
side of it. The skin on the embryo is very thin and
translucent. The placenta and the embryo are connected by
the umbilical cord. The one large artery and two smaller
veins run through the umbilical cord. Everything that the
embryo needs will come through the umbilical cord.
Fetal Development
After about eight weeks from the LMP the tiny little
embryo has every organ that it ...

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