Sinh học - Chapter 34: Vertebrate evolution and diversity
2. The dorsal, hollow nerve cord develops in the vertebrate embryo from a plate of ectoderm that rolls into a tube dorsal to the notochord. Other animal phyla have solid nerve cord, usually located ventrally. The nerve cord of the chordate embryo develops into the central nervous system: the brain and spinal cord.
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- ap34_chordates_0065.ppt