Both nerves and wires conduct electrical currents that generate electromagnetic fields extending into the surrounding space. These fields will, in turn, activate currents in otherwise dormant wires or nerves nearby. This is the principle behind radio and television transmitters and receivers, dynamos, and transformers, and as with these man-made devices, “interference” (or static) in nerves or wires is a potential problem. To protect signals from corruption by neighboring electromagnetic fields, each individual nerve is encased in insulating material.
Insulation
