nerve' cord"

1. a single hollow tract of nervous tissue that constitutes the central nervous system of chordates and develops into the spinal cord and brain in vertebrates.
2. a solid double strand of nerve fibers along the length of the body in elongate invertebrates, as earthworms and insects, connecting with a pair of nerve ganglia at each body segment.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

nerve centernerve fiber


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