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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.
This sheath is called the myelin sheath and is made up of Schwann cells in the peripheral nerves and oligodendrocytes in the central nervous system nerves. This insulation can be damaged by compression just as the nerve membrane itself can be injured.he central nervous system nerves are supported by âassistant cellsâ called oligodendrocytes and the peripheral nervous system nerves are support byâ assistant cellsâ called Schwann cells. There are marked differences between the two types of nerves.