nerve cord
noun Date: 1877 1. the pair of closely united ventral longitudinal nerves with their segmental ganglia that is characteristic of many elongate invertebrates (as earthworms) 2. the dorsal tubular cord of nervous tissue above the notochord of a chordate that comprises or develops into the central nervous system

New Collegiate Dictionary. 2001.

Look at other dictionaries:

  • Nerve cord — may refer to the following structures: in invertebrates, it refers to the ventral nerve cord, whereas in chordates, it stands for the dorsal nerve cord. This disambiguation page lists articles associated with the same title. If an int …   Wikipedia

  • nerve cord — nerve′ cord n. 1) anat. the hollow dorsal tract of nervous tissue that constitutes the central nervous system of all chordates and that developed as the spinal cord and brain of vertebrates 2) anat. zool. ivt a double strand of nerve fibers in… …   From formal English to slang

  • nerve cord — n the dorsal tubular cord of nervous tissue above the notochord of a chordate that in vertebrates includes or develops an anterior enlargement comprising the brain and a more posterior part comprising the spinal cord with the two together making… …   Medical dictionary

  • nerve cord — noun : a cord of nervous tissue; specifically : the pair of closely united ventral longitudinal nerves with their segmental ganglia that is characteristic of many elongate invertebrates (as earthworms) * * * 1. a single hollow tract of nervous… …   Useful english dictionary

  • 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… …   Universalium

  • nerve cord — noun A dorsal tubular cord of nervous tissue above the notochord of a chordate …   Wiktionary

  • ventral nerve cord — Ganglia or connectives in somites joined by single or double tract of nerve fibers running longitudinally beneath alimentary canal [McLaughlin, 1980]. (Order Cladocera): Pair of widely separated, longitudinal nerve cords extending into trunk from …   Crustacea glossary

  • Dorsal nerve cord — The dorsal nerve cord is one of the embryonic features unique to chordates, along with a notochord, a post anal tail and pharyngeal slits. The dorsal nerve cord is a hollow cord dorsal to the notochord.It is formed from a part of the ectoderm… …   Wikipedia

  • Ventral nerve cord — The ventral nerve cords make up the nervous system of some phyla of the invertebrates particularly within the nematodes, annelids and the arthropods. It usually consists of cerebral ganglia anteriorly with the nerve cords running down the ventral …   Wikipedia

  • ventral nerve cord — The primary nerve cord of all invertebrates, except those of the Hemichordata and Chordata phyla …   Dictionary of invertebrate zoology

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