A tubular nerve cord that runs along the dorsal (back) side of chordates, characterized by a hollow center filled with fluid. This structure develops into the brain and spinal cord in vertebrates.
Descriptive term combining 'dorsal' from Latin 'dorsum' (back), 'hollow' from Old English, and 'nerve cord' from Latin 'nervus' and 'chorda.' This anatomical description was formalized in the 19th century to distinguish chordate nervous systems from the solid, ventral nerve cords of invertebrates.
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