Axions are the signal transmission cells bundled in the nerve sheath. They have protien electric dipoles that do behave like dominoes giving rise to a traveling action potential. https://www.youtube.com/watch?v=lo6x4eulY9g I will program the HTML to pick up youtube and other links http://lessonpeer.com/drhillteach/Nerve%20Pulses%20-%20Just%20like%20dominoes.mp3