The blastocyst is now an embryo. This is when the baby's
brain, spinal cord, heart and organs begin to form. According to Mayo
Clinic, the embryo is made of three layers; first the ectoderm, which is
the outermost layer of skin, the eyes, inner ear, connective tissues
and the central and peripheral nervous systems. The baby's heart, bones,
muscles, kidneys, and most of the reproductive system are formed in the
middle layer of cells that is called the mesoderm. The baby's lungs,
intestines and bladder are formed in the inner layer of cells, which is
called the endoderm. According to Gerber, "A sheet of cells on the back
of the embryo folds in the middle to form a tube, which will become the
baby's spinal cord." At one end of this tube the brain and its major
sections are formed. At the end of this week the baby is about the size
of the tip of a pen.
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