myelin sheath
An electrically insulating fatty layer that surrounds the axons of many neurons. It is an outgrowth of glial cells: Schwann cells supply the myelin for peripheral neurons while oligodendrocytes supply it to those of the central nervous system.
GO:0110165
cellular anatomical structure
is_a
Schwann cell myelin sheath
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astrocyte sheath
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oligodendrocyte myelin sheath
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