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: ) 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]
Pair of widely separated longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain (with series of ganglia). [Stachowitsch, 1992]
Pair of widely separated, longitudinal nerve cords extending posteriorly from brain; forms ladder-like chain. [Stachowitsch, 1992]
(Taxon-specific: Family Pycnogonidae) 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]
Pair of longitudinal nerve cords extending from subesophageal ganglia to end of abdomen; bears pair of ganglia in each somite. [Stachowitsch, 1992]
Longitudinal nerve cord extending posteriorly from brain (supraesophageal ganglion). Located below digestive tract; bears 16 pairs of segmentally arranged ganglia. [Stachowitsch, 1992]
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]
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]
Longitudinal nerve cord extending below digestive tract from subesophageal ganglion into abdomen. Bears series of segmentally arranged ganglia (anteriorly displaced in pleon). [Stachowitsch, 1992]
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]
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: Class Secernentea) 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: Order Rhabditida) 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]
Pair of longitudinal nerve cords extending from brain to posterior end of body; bears series of ganglia.
(syn. ventral nerve chain) [Stachowitsch, 1992]
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]
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]
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]
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]
Longitudinal nerve cord extending posteriorly from brain. Located below digestive tract; bears segmentally arranged ganglion pairs. [Stachowitsch, 1992]
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]