#medullated_nerve_fiber__myelinated_nerve_fiber  a nerve fiber encased in a sheath of myelin
  supertype:  nerve_fiber__nervefiber__nerve_fibre__nervefibre  a threadlike extension of a nerve cell
  part:  medullary_sheath__medullarysheath__myelin_sheath  a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
     part:  axolemma  outer membrane covering an axon
     part:  Ranvier's_nodes__nodes_of_Ranvier  small gaps in the myelin sheath of medullated axons
     part:  oligodendroglia  tissue consisting of glial cells with sheet-like processes that form the myelin sheath of nerve fibers
        part:  oligodendrocyte  a cell of the oligodendroglia

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