"Yes we have a neural network and there is much about the human body that we have no understanding or comprehension of, or is simply kept from us."

the Human brain is extremely complicated, but also extremely inefficient. We understand how neural networks work and use them for AI everyday already. All we need to do is a get a computer capable of simulating a network the size of a human brain.

Even if we don't understand how the brain connects together we can still make a neural network that intelligent. Thats the thing about neural networks, they teach themselves.