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This is a dorsal (from the rear) view of the embryo at the end of its third week of development after fertilisation. The central white tube-like structure on the back of the embryo is the neural tube. The neural tube serves as the precursor for the spinal cord. The white ridges appearing on both sides of the neural tube are somites. 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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