NATHAN DEVERY / SCIENCE PHOTO LIBRARY NATHAN DEVERY / SCIENCE PHOTO LIBRARY
Myelin sheath and glial cells. The myelin sheath is adielectric material that forms a layer around the axon of a neuron and is an outgrowth of a type of glial cell. The glial cell maintains homeostasis, forms the myelin and provides protection for neurons in the brain and peripheral nervous system.
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