How is the nervous system of nematodes organized? Where are the neural chords located in their body?

How is the nervous system of nematodes organized? Where are the neural chords located in their body?
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Roundworms have a ganglial nervous system with an anterior neural ring representing (evolutionarily) a primitive cephalization. Nematodes have two main longitudinal ganglial chords that extend one dorsally and the other ventrally under the epidermis. There may also be nerves lateral to these main chords. The nervous system of a free-living nematode, Caenorhabditis elegans, has been well-studied in neurophysiological research and presents 302 neurons. The nematode C. Elegans was the organism used in the research on the genetic regulation of organogenesis and apoptosis whose researchers won the Nobel prize of Medicine in 2002 (Brenner, Horvitz and Sulston). Phylum Nematoda Review - Image Diversity: nematode nervous system
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