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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.
Schwann cells. satellite cells found in the PNS, and facilitate the activity of the neurons, layers of the cell form the myelin sheath around axons and directly influence the propagation of nerve impulses (the thicker the myelin sheath the faster the propagation of nerve impulses). î î î.