#medullary_sheath__medullarysheath__myelin_sheath  a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
  supertype:  #sheath.natural_covering__case  an enveloping structure or covering enclosing an animal or plant organ or part
  part:  #axolemma  #Ranvier's_nodes  #oligodendroglia
  substance:  #myelin
  part of:  #medullated_nerve_fiber__myelinated_nerve_fiber  a nerve fiber encased in a sheath of myelin

No statement uses or specializes #medullary_sheath; click here to add one.