English: This diagram depicts a cross section of a vertebrate embryo in the neurula stage. The sections labeled are the major contributors in the formation of vertebrate structures and organs. The notochord functions as a dorsal supporting rod, and it is later replaced by the vertebral column in all vertebrates except lancelets. The neural tube becomes the brain and spinal cords. The somites give rise to the vertebral column and the muscles of each segment. When the internal organs develop, they will be located in the coelom.
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