@nony - What amazes me is how the brain can adapt. For example, I’ve seen stories on television where people have had some damage to their motor cortex, the area that controls body movements.
Yet, the brain adapted and these people were still able to function some way, although to a lesser extent. I’ve heard that the brain goes through a “rewiring” of sorts, delegating the body movement functions to a different part of the brain.
So that part will pinch hit, so to speak, to take over where the motor cortex was damaged. That’s what amazes me more than how each part of the brain is divided.