nerve cord

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nerve cord A large bundle of nerve fibres, running down the longitudinal axis of the body, that forms an important part of the central nervous system. Most invertebrates have a pair of solid nerve cords, situated ventrally and bearing segmentally arranged ganglia. All animals of the phylum Chordata have a dorsal hollow nerve cord; in vertebrates this is the spinal cord.

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nerve cord The bundle of nerve fibres that runs along the longitudinal axis of the body. In most invertebrates there are two, solid nerve cords; in Chordata the nerve cord is hollow and in vertebrates it is the spinal cord.