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The Endowment for Human Development
The Endowment for Human Development
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End of Embryonic Period


8 weeks

From The Biology of Prenatal Development.Buy Now

Script: Eight weeks marks the end of the embryonic period.

During this time, the human embryo has grown from a single cell into the nearly 1 billion cells which form over 4,000 distinct anatomic structures.

The embryo now possesses more than 90% of the structures found in adults.

All ages referenced to fertilization, not last menstrual period.
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