#Ranvier's_nodes__nodes_of_Ranvier  small gaps in the myelin sheath of medullated axons
  supertype:  opening.space__gap  an open or empty space in or between things; "there was a small opening between the trees"; "the explosion made a gap in the wall"
  part of:  medullary_sheath__medullarysheath__myelin_sheath  a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
     part of:  medullated_nerve_fiber__myelinated_nerve_fiber  a nerve fiber encased in a sheath of myelin

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