The difference between axons of the central nervous system covered by oligadendsites, and those of the periferal a, shwan cells. If you get an injured nerve in the periphery, if you were to cut a whole lot of axons in a nerve, let's say like a mediam nerve, tas inor gong, to into your forearm. You can't rely on other neurons, because they're so dispersed, to pick up the slack as tat make sens i tell i've always thought the reason why that was the case definitely the njury.