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The dorsal nerve cord is one of the embryonic features unique to chordates, along with a notochord, a post-anal tail and pharyngeal slits. It is a hollow cord dorsal to the no â¦ tochord.ike humans, A dorsal nerve cord would be present on the back of the person or chordate. Some invertebrates such as arthropods, have a ventral nerve cord on the belly..
Making the world better, one answer at a time. 1) The notochord is the defining structure of the phylum Chordata, which includes all vertebrates. In its mature state, the notochord is a rod of large cells constrained by a thick extracellular sheath and positioned between the developing spinal cord and gut.o, the notochord and the nerve cord arise from different germ layers. The notochord is replaced by an ossified backbone, though there are still remnants between the vertebrae â¦ . The nerve cord, however, is protected by the ossified vertebral column.