ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY ANATOMICAL TRAVELOGUE / SCIENCE PHOTO LIBRARY
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This is a left-sided view of the embryo at the end of its third week of development after fertilisation. At left is the yolk sac, with proteins to provide nutrition. The orange ridge-like markings on the back of the embryo are somites, which line up on both sides of the neural tube, the region of spinal cord development. The somites serve as the basis for the development of the skeletomuscular system. At this stage of its development, the embryo is 2.5 millimetres long.
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