Nerve Cord

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nerve cord [′nərv ‚kȯrd]

(invertebrate zoology)

Paired, ventral cords of nervous tissue in certain invertebrates, such as insects or the earthworm.

(zoology)

Dorsal, hollow tubular cord of nervous tissue in chordates.

Nerve Cord

a structure within the central nervous system of annelids and arthropods. The nerve cord is situated on the ventral side of the body, under the gut. It is connected to the cerebral ganglia. The nerve cord consists of a pair of partially fused longitudinal nerve trunks, called connectives, and of pairs of segmental ganglia that innervate each of the body segments. The primitive form of the nerve cord, which occurs in some primitive annelids, polychaetes, and onychophorans, is scaliform, having widely spaced trunks and long commissures between the ganglia.

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No references found			In 1894, marine biologist Walter Garstang suggested that the primitive ciliary band, which harbors neurons, evolved into the dorsal nerve cord of vertebrates. How an ancient sea creature grows up. (Stalking Larvae) by Marzuola, C. / Science News A notochord is a skeletal component, not a primitive nerve cord. Splashdown. (Letters) by Eagan, J. Roger / Science News Each focal spot impinges on a bundle of nerves that feeds into a larger nerve cord, the researchers observed by microscopy. 20/20 lenses coat body of sea creature by Schubert, C. / Science News			Nerses Shnorali Nersesian, Babken Nersesian, Babken Pogosovich Nersesian, Rachiia Nersesian, Rachiia Nersesovich Nersisian, Mkrtich Nersisian, Mkrtich Gegamovich Nerstrand-Big Woods State Park Nertera Nerthus Neruda Neruda, Jan Neruda, Pablo Nerussa Nerva Nerva, Marcus Cocceius Nerval Nerval, Gerard De Nerval, Gérard De nervate Nerve nerve block nerve cell Nerve Center nerve centre Nerve Cord nerve deafness Nerve Ending Nerve Fiber Nerve Fiber, Vasomotor nerve gas nerve growth factor Nerve Impulse nerve net Nerve Plexus Nerve Tissue nerve tracing nerve tract Nerve, Accessory Nervi, Pier Luigi Nervii Nervism Nervo, Amado nervous nervous breakdown Nervous Stimulant Nervous System Nervous system disorders Nervous Systems, Types of nervous tissue nervousness			Nerve cells Nerve cells Nerve cells nerve center nerve center nerve center nerve center nerve centers nerve centers nerve centre nerve centre nerve centres nerve centres nerve compression nerve compression nerve compression syndrome nerve compression syndrome nerve compression syndrome nerve conduction Nerve conduction studies Nerve conduction studies Nerve conduction study nerve conduction test nerve conduction test Nerve conduction testing Nerve conduction velocity Nerve conduction velocity Nerve Conduction Velocity Distribution Nerve Conduction Velocity Study Nerve conduction velocity test Nerve Cord nerve cords nerve cuff nerve cuff nerve cuff nerve cuff nerve deafness nerve deafness nerve deafness nerve decompression nerve decompression nerve decompression nerve degeneration nerve degeneration nerve degeneration nerve degeneration nerve end nerve ending nerve ending nerve ending nerve ending nerve ending pain nerve ending pain nerve ending pain nerve ending pain nerve endings nerve endings nerve endings nerve endings nerve entrapment nerve entrapment

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