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The '''ventral nerve cords''' make up the [[nervous system]] of some [[phylum | phyla]] of the [[invertebrate]]s, particularly within the [[nematode]]s, [[annelid]]s and the [[arthropod]]s. It usually consists of [[cerebral]] [[ganglion | ganglia]] [[anterior | anteriorly]] with the nerve cords running down the [[Anatomical terms of location|ventral]] ("belly", as opposed to back) plane of the organism. This characteristic is important in qualifying the difference compared to the [[chordate]]s, which have a [[dorsal nerve cord]].
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Ventral nerve cords from [[anterior]] to [[posterior]] (the [[thorax|thoracic]] and [[abdomen|abdominal]] [[tagma]] in the arthropods) are made up of segmented ganglia that are connected by a tract of nerve fibers passing from one side to the other of the nerve cord called commissures[http://medical-dictionary.thefreedictionary.com/commissures]. The complete system bears some likeness to a rope [[ladder]]. In some animals the bilateral ganglia are fused into a single large ganglion per segment. This characteristic is found mostly in the [[insect]]s.
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==See also==
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*[[Dorsal nerve cord]] in [[Chordate]]s
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*[[Nerve net]] in [[cnidaria]] and [[echinodermata]] phyla
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*[[Protocerebrum]]
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*[[Deutocerebrum]]
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*[[Tritocerebrum]]
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==References==
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*{{cite book |last=Hickman |first=Cleveland |coauthors=Roberts L. Keen S. Larson A. Eisenhour D|title=Animal Diversity |edition=4th |publisher=McGraw Hill |location=New York|language=English |isbn=978-0-07-252844-2}}
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==External links==
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* [http://www.prokop.co.uk/Research/Drosi-Info/nerve-cords.html Comparison of spinal cord and ventral nerve cord]
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* [http://www.lobsters.org/tlcbio/biology6.html Nervous system of a lobster]
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* [http://www.entomology.umn.edu/cues/4015/morpology/ Insect morphology]
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[[Category:Animal anatomy]]
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Latest revision as of 09:50, April 5, 2010

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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 ("belly", as opposed to back) plane of the organism. This characteristic is important in qualifying the difference compared to the chordates, which have a dorsal nerve cord.

Ventral nerve cords from anterior to posterior (the thoracic and abdominal tagma in the arthropods) are made up of segmented ganglia that are connected by a tract of nerve fibers passing from one side to the other of the nerve cord called commissures[1]. The complete system bears some likeness to a rope ladder. In some animals the bilateral ganglia are fused into a single large ganglion per segment. This characteristic is found mostly in the insects.

See alsoEdit

ReferencesEdit

  • Hickman, Cleveland; Roberts L. Keen S. Larson A. Eisenhour D. Animal Diversity, 4th (in English), New York: McGraw Hill.

External linksEdit

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