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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..
However, unlike echinoderms, chordates are characterized by a notochord, jointed appendages, and segmentation. Four features characterize the chordates and have played an important role in the evolution of the phylum: 1. A single, hollow nerve cord runs just beneath the dorsal surface of the animal.In vertebrates, the dorsal nerve cord differentiates into the brain and spinal cord.2. A flexible rod, the notochord, forms on the dorsal side of the primitive gut in the early embryo and is present at some developmental stage in all chordates.The notochord is located just below the nerve cord.n vertebrates, the dorsal nerve cord differentiates into the brain and spinal cord. 2. A flexible rod, the notochord, forms on the dorsal side of the primitive gut in the early embryo and is present at some developmental stage in all chordates. The notochord is located just below the nerve cord.