primary nerve cordGo to external page http://purl.obolibrary.org/obo/UBERON_0005053
A cluster of neurons that is the most prominent longitudinally extending condensed part of a nervous system. [ http://www.ncbi.nlm.nih.gov/pubmed/21062451 ]
Synonyms: nerve cord true nerve cord
some species have multiple longitudinal nerve cords; this class refers to the most prominent one, which is dorsal in chordates and ventral in others.