Let’s say I touch a piece of hot apple pie. My finger knows it’s warm. The sensation from my finger travels to my wrist, where the nerve endings from my fingers / hand join up. Then the sensation travels up my arm, to my torso, to my spine, where all the other nerves from my feet and hands and stomach and legs all join.
Are there individual paths of fibers that remain distinct all the way into the brain? is there a unique ‘signature’ that lets the brain know where a certain nerve signal is coming from?