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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 cell in Medicine Expand. Schwann cell (shwÃ¤n, shvÃ¤n) n. Any of the cells that cover the nerve fibers in the peripheral nervous system and form the myelin sheath. Also called neurilemma cell. Schwann cell. Any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath. See more at myelin.