CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Human embryo. Illustration of human embryo development 30 days after fertilisation. During the fifth week of embryonic development the eyes and ear structures start to form, the brain develops into five areas, some cranial nerves are visible, and the arm and leg buds become visible. The amniotic sac (blue) surrounds the embryo.
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