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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. Definition. noun, plural: Schwann cells. A glial cell that wraps around the nerve fiber in the peripheral nervous system, and forms the myelin sheaths of peripheral axons. Supplement. Schwann cells form a fatty material called myelin to insulate the axons in the peripheral nervous system. This method decreases membrane capacitance in the axon, thus, allowing saltatory conduction. Non-myelinating Schwann cells are involved in maintenance of axons and are crucial for neuronal survival.