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The Endowment for Human Development
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Blood Cells and Bone Marrow


3 months, 3 weeks

From The Biology of Prenatal Development.Buy Now

Script: در هفته 15، سلول ھای اصلی تشکیل دھنده خون بوجود آمده و در مغز استخوان تکثیر می شوند. تشکیل بیشتر یاخته ھای خون در اینجا واقع خواھد شد.

All ages referenced to fertilization, not last menstrual period. One month = 4 weeks.
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