Dictionary
myelin sheath
noun
Definition of MYELIN SHEATH
: a layer of myelin surrounding the axons of some neurons —called also medullary sheath
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First Known Use of MYELIN SHEATH
1891
Medical Dictionary
myelin sheath
noun
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
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