Neuroglia - Image 8
An ultrastructural drawing of a CNS oligodendrocyte contributing myelin internodes to several axons. A myelin sheath is interrupted by nodes, where myelin is absent and the axon (A) is exposed to CNS extracellular space (ES). Myelin internodes are formed by wrappings of oligodendrocyte plasma membrane. Cytoplasm (cyt) is generally absent from the membrane wrappings, except in the paranode region adjacent to the node.
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