Before revision:   Our study shows that the underlying topology in neural networks is significantly qualitatively different than the same from other biological networks and  they may have evolved  such a way that they inherit a  structure which is excellent and robust in communication.
After revision:  Among all biological networks studied here, the undirected structure of neuronal networks not only pos- sesses the small-world property but the same is expressed remarkably to a higher degree than any randomly generated network which possesses the same degree sequence. A relatively high percentage of nodes, in neuronal networks, form a higher core in their structure. Our study shows that the underlying topology in neural networks is significantly qualitatively different than the same from other biological networks and they may have evolved such a way that they inherit a structure which is excellent and robust in communication.