#long_bone__os_longum  in vertebrate animals: a long cylindrical marrow-containing bone of a limb
  supertype:  bone__os  rigid connective tissue that makes up the skeleton of vertebrates
  subtype:  epiphysis  diaphysis  arm_bone  leg_bone
  part:  endosteum  vascular membrane that lines the inner surface of long bones
  part:  metaphysis  the growing part of a long bone between the diaphysis and the epiphysis

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