I am an electronic engineer so I am thinking about this from an electronics outlook.
How does the addressing system work, As I see it, the nervous system is small parallel branches attached to larger "serial" lines (spinal cord).
The serial line is then attached to the brain, but how does it then figure out where the message came from and then get the message back to the place it came from.
If I were to build a robot I would have an addressing system with each message and maybe some kind of error checking to make sure the messages don't become corrupted, but as it's not an electronic system I don't see how the brain could possibly do this. unless it is a fully parallel system and there is a single wire going from every sensor back to the CPU..