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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..
The PNS is the part of the nervous system that lies outside the CNS. It consists of ganglia, cranial nerves arising from the brain, the spinal nerves arising from the spinal cord. They connect the brain and spinal cord with receptors, muscles, and glands.ach spinal nerve is formed from the union of 1000âs of both motor axons (from anterior gray horn cell bodies) and sensory axons (from cell bodies in posterior root ganglion). Note that the spinal nerves are part of the PNS but the spinal cord is part of the CNS.