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myelin sheath
Definition of myelin sheath
: 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
From the M-W Editors
First Known Use of myelin sheath
1891
Medical Dictionary
myelin sheath
Medical Definition of myelin sheath
: 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
Learn More about myelin sheath
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Britannica.com: Encyclopedia article about myelin sheath
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