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 posterior part of brain; forms ladder-like chain with relatively few, occasionally fused ganglia [Stachowitsch, 1992].
(Order Notostraca):
Pair of widely separated longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain (with series of ganglia) [Stachowitsch, 1992].
(Order Diplostraca):
Pair of widely separated, longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain [Stachowitsch, 1992].
(Order Anostraca):
Pair of widely separated, longitudinal nerve cords originating from posterior part (tritocerebrum) of brain and forming ladder-like chain (with series of ganglia) extending to second abdominal somite [Stachowitsch, 1992].
(Class Cephalocarida):
Pair of longitudinal nerve cords extending from subesophageal ganglia to end of abdomen; bears pair of ganglia in each somite [Stachowitsch, 1992].
(Order Cumacea):
Longitudinal nerve cord extending posteriorly from brain (supraesophageal ganglion). Located below digestive tract; bears 16 pairs of segmentally arranged ganglia [Stachowitsch, 1992].
(Order Decapoda):
Longitudinal pair of more or less fused nerve cords extending from subesophageal ganglion to telson. Basically bears pair of (fused) ganglia in each somite [Stachowitsch, 1992].
(Order Amphipoda):
Longitudinal nerve cord extending below digestive tract from subesophageal ganglion to end of abdomen. Bears series of segmentally arranged (posteriorly occasionally fused) ganglia [Stachowitsch, 1992].
(Order Isopoda):
Longitudinal nerve cord extending below digestive tract from subesophageal ganglion into abdomen. Bears series of segmentally arranged ganglia (anteriorly displaced in pleon) [Stachowitsch, 1992].
(Order Mysida):
Longitudinal nerve cord extending below digestive tract to last abdominal somite. Extends posteriorly from subesophageal ganglion or directly from supraesophageal ganglion via esophageal connectives. Bears series of segmental ganglia [Stachowitsch, 1992].
(Order Stomatopoda):
Longitudinal pair of fused nerve cords extending from postoral ganglion to posterior end of body; located midventrally and bearing ganglia (segmental ganglia) in each somite [Stachowitsch, 1992].
(Order Leptostraca):
Longitudinal nerve cord extending below digestive tract to sixth abdominal somite (next to last somite). Joined to brain (supraesophageal ganglion) by pair of esophageal connectives; bears series of segmentally arranged ganglia [Stachowitsch, 1992].
(Subclass Cirripedia):
Pair of nerve cords extending posteriorly from subesophageal ganglion. Ganglia of ventral nerve cord may be fused with subesophageal ganglion to form large ventral nerve mass [Stachowitsch, 1992].
(Subclass Mystacocarida):
Pair of longitudinal nerve cords extending from brain to posterior end of body; bears series of ganglia. (Syn. ventral nerve chain) [Stachowitsch, 1992].
(Class Ostracoda):
Paired, longitudinal nerve cord extending through trunk; bears pair of ganglia near base of appendages. Typically more or less concentrated and forming, along with subesophageal ganglion, posterior part of circumesophageal nerve ring [Stachowitsch, 1992].
(Class Ostracoda):
Unpaired, longitudinal nerve cord extending through thorax and joined to supraesophageal ganglion by pair of circumesophageal connectives. May be concentrated anteriorly in parasitic copepod, leading to prominent nerve ring around esophagus [Stachowitsch, 1992].
(Class Remipedia):
Pair of longitudinal nerve cords extending from circumesophageal connectives to posterior end of body; connected to eachoth via commissures and bearing only modestly developed trunk-segment ganglia [Stachowitsch, 1992].
(Superorder Syncarida):
In anaspidacean, longitudinal nerve cord extending below digestive tract to end of abdomen. Band-shaped, bearing series of segmental ganglia. Connected anteriorly to supraesophageal ganglion by pair of esophageal connectives [Stachowitsch, 1992].
(Order Thermosbaenacea):
Longitudinal nerve cord extending posteriorly from brain. Located below digestive tract; bears segmentally arranged ganglion pairs [Stachowitsch, 1992].
(Order Euphausiacea):
Longitudinal nerve cord extending below digestive tract to last (sixth) abdominal somite. Joined to brain (supraesophageal ganglion) by pair of esophageal connectives; bears series of segmentally arranged ganglia [Stachowitsch, 1992].

Crustacea glossary. . 2011.

Look at other dictionaries:

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

  • ventral nerve cord — noun : a chain of connected segmental ganglia lying against the body wall in the body of an arthropod or annelid …   Useful english dictionary

  • 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

  • ventral nerve chain — Ganglia or connectives on somites joined by single or double nerve cord running longitudinally beneath alimentary canal [Moore and McCormick, 1969]. See: ventral nerve cord [McLaughlin, 1980]. (Order Tanaidacea): Longitudinal nerve cord extending …   Crustacea glossary

  • 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 — 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… …   New Collegiate Dictionary

  • 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

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  • ventral sympathetic nervous system — (ARTHROPODA: Insecta) A pair of transverse nerves associated with the ganglia of the ventral nerve cord in each segment, passing to the spiracles of their segment; may be connected to the perisympathetic system …   Dictionary of invertebrate zoology

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