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Subject - neurophysiology
The myelin sheath is an insulating coat of myelin around the axons of nerve cells. In the peripheral nervous system, the myelin sheath is formed by Schwann cells that engulf the axons in multiple places. In contrast, the myelin sheaths of the central nervous system are formed by oligodendrocytes. Myelin sheaths are divided by constrictions (nodes of Ranvier) into segments (internodes) spaced about 1mm apart. Sheathed axons/fibres are referred to as myelinated.