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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. The nervous system is a Network of specialized cells that communicate information about an animal's surroundings and itself A phylum ( Plural: phyla) is a Taxonomic rank between Kingdom and above Class. An invertebrate is an Animal lacking a Vertebral column. The group includes 98% of all animal Species — all animals except those in the Chordate The nematodes or roundworms ( Phylum Nematoda from Greek (nema "thread" + -ode "like" are one of the most common The annelids, collectively called Annelida (from Latin anellus "little ring" are a large phylum of Animals comprising Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " It usually consists of cerebral ganglia anteriorly with the nerve cords running down the ventral plane of the organism. In Anatomy, a ganglion (pl ganglia) is a tissue mass. Neurology In neurological contexts ganglia are composed mainly of In fields of Anatomy, anatomical terms of location are descriptive terms to help identify relative positions or directions within a species In fields of Anatomy, anatomical terms of location are descriptive terms to help identify relative positions or directions within a species This characteristic is important in qualifying the difference compared to the chordates which have a dorsal nerve cord. Chordates ( Phylum Chordata) are a group of Animals that includes the Vertebrates together with several closely related Invertebrates 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

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]. In fields of Anatomy, anatomical terms of location are descriptive terms to help identify relative positions or directions within a species In fields of Anatomy, anatomical terms of location are descriptive terms to help identify relative positions or directions within a species The thorax is a division of an Animal 's body that lies between the head and the Abdomen. In Vertebrates such as Mammals the abdomen (belly constitutes the part of the body between the Thorax (chest and Pelvis. In Anatomy, a ganglion (pl ganglia) is a tissue mass. Neurology In neurological contexts ganglia are composed mainly of The complete system bears some likeness to a rope ladder. A ladder is a vertical or inclined set of rungs or steps. There are two types rigid ladders that can be leaned against a vertical surface such as a Wall, and In some animals the bilateral ganglia are fused into a single large ganglion per segment. This characteristic is found mostly in the insects. Insects ( Class Insecta) are a major group of Arthropods and the most diverse group of Animals on the Earth with over a million described

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