Why Do We Need Nerves?

We need nerves so that we can understand what were feeling and whats going on around us..... Our nerves sends a message to our brain and tells it whats going on

We need nerves to walk  and talk.

So if you scuff your knee it will send the message to your brain or your nervous system triggering a reaction from your brain or autonomic nervous system. And then you become self aware of the scuffed knee and say hey that hurts a millisecond later...

So we can feel pain. Also it is how your brain send signals for your body to do things, e.g picking up a book...