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Schwann cells are the supporting cells of the PNS. Like oligodendrocytes schwann cells wrap themselves around nerve axons, but the difference is that a single schwann cell makes up a single segment of an axon's myelin sheath.
In your nervous system, cells called Schwann cells grow exceedingly large cell membranes, which wrap tightly around the long processes of nerves. Cell membranes of Schwann cells are unique in that they contain as much as 50 percent more cholesterol and up to 75 percent less protein than other types of cell membranes.This wrapping forms a thick insulating layer of cholesterol-based cell membrane known as myelin.yelin may also contain a small percentage of saturated fatty acids, which decrease the fluidity of the myelin membrane compared to cholesterol, which provides considerable membrane fluidity, according to Patricia Armati, PhD., editor of the book The Biology of Oligodendrocytes..