Myelin sheath is the insulating covering that surrounds an axon with multiple spiral layers of myelin.
The insulating covering that surrounds an axon with multiple spiral layers of myelin, that is discontinuous at the nodes of Ranvier, and that increases the speed at which a nerve impulse can travel along an axon—called also medullary sheath.www.merriam-webster.com/dictionary/myelin%20sheath
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