myelin sheath

myelin sheath


Definition of MYELIN SHEATH

:  a layer of myelin surrounding the axons of some neurons —called also medullary sheath

First Known Use of MYELIN SHEATH


myelin sheath

noun    (Medical Dictionary)

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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