About This Artwork: An axon is part of a neuron. It is the part of the nerve that needs to wear a coat called myelin. This works in the body a lot like electricity works when it sends a current through a wire from one place to another: say like a plug to a light bulb. The plug is your brain. The light bulb can be your big toe. The plastic sheath around the wire needs to be there in order to keep the signal in the wire protected so it arrives at the light bulb. MS makes it so that the myelin sheath becomes corroded. The signal doesn't get through properly and your big toe won't light up like it used to.