The Evolution of Myelin.
Primitive animals living in the dark recesses of the sea bed lead a quiet and relatively unchallenged life. When animals started to venture away from such protected areas in search of food, the need for flight from external danger became necessary. Evolutionary pressure resulted in the selection of features which favoured escape. This is where myelin came in. Myelin is an insulating material that is wrapped around the axons of nerve cells. Its job is to increase the speed of conduction of electrical signals along the nerve fibre to muscle targets. The result is faster reactions to danger and a better chance of survival. So what is myelin and how does it work?