EDELMANN / SCIENCE PHOTO LIBRARY. EDELMANN / SCIENCE PHOTO LIBRARY.
The human foetus after 8-10 weeks development, seen from the rear, with the head at left and the formative buds of the arms and legs visible. At this time the primitive organ systems are almost fully developed: the 3 initial divisions of the fore-, mid-, and hindbrain have become 5 divisions and further growth has caused the head to bend over. Spinal nerves grow out from the spinal cord, connecting with body organs as they are being formed.
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