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nerve cord

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nerve cord

–noun
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.

Origin:
1875–80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Medical Dictionary

Main Entry: nerve cord
Function: noun
: the dorsal tubular cord of nervous tissue above the notochord of a chordate that in vertebrates includes or develops an anteriorenlargement comprising the brain and a more posterior part comprising the spinal cord with the two together making up the central nervous system
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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