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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 unit-a single Schwann cell and all of the axons lying in troughs indenting its surface. Schwann cells-cells of ectodermal (neural crest) origin that compose a continuous envelope around each nerve fiber of peripheral nerves.