CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Human embryo. Illustration of human embryo development 23 days after fertilisation. During the fourth week of embryonic development the brain, spinal cord, heart and other organs begin to form. The amniotic sac (blue) surrounds the embryo. The yolk sac (yellow) provides nourishment for the early embryo.
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