Definitions

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Ventral nerve cord

Ganglia or connectives in somites joined by single or double tract of nerve fibers running longitudinally beneath alimentary canal. [McLaughlin, 1980]
(Taxon-specific: 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]
(Taxon-specific: Order Notostraca) Pair of widely separated longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain (with series of ganglia). [Stachowitsch, 1992]
(Taxon-specific: Order Diplostraca) Pair of widely separated, longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain. [Stachowitsch, 1992]
(Taxon-specific: 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]
(Taxon-specific: Class Cephalocarida) Pair of longitudinal nerve cords extending from subesophageal ganglia to end of abdomen; bears pair of ganglia in each somite. [Stachowitsch, 1992]
(Taxon-specific: Order Cumacea) Longitudinal nerve cord extending posteriorly from brain (supraesophageal ganglion). Located below digestive tract; bears 16 pairs of segmentally arranged ganglia. [Stachowitsch, 1992]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: 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]
(Taxon-specific: Order Thermosbaenacea) Longitudinal nerve cord extending posteriorly from brain. Located below digestive tract; bears segmentally arranged ganglion pairs. [Stachowitsch, 1992]
(Taxon-specific: 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]