In the central nervous system, we have this outer fatty insulation that wraps around the axon an. In the prifeal nervous system, so this is outside the spinal cored brain, it's done by a different cle, which we call a swan cell. Why don't eligo danger sits wrap in the peripheral and why don't swan cells wrap in the central? That's a good question. What's swe quickly, just msatelite cells. Mention wher they fit in along the processs or is that going to neuro no, i think becase that's all we're going to finish and then go hove on to the muscle. So i think let