#skeletal_structure  any structure created by the skeleton of an organism
  supertype:  #anatomical_structure__structure__complex_body_part__bodily_structure__body_structure  a particular complex anatomical structure; "he has good bone structure"
  part of:  #skeletal_system
  subtype:  #jaw  the part of the skull of a vertebrate that frames the mouth and holds the teeth
  subtype:  #rib_cage__ribcage  the bony enclosing wall of the chest
  subtype:  #arch.skeletal_structure  a curved bony structure supporting or enclosing organs (especially arches of the feet)
     subtype:  #metatarsal_arch  the short lateral arch formed by the heads of the metatarsals
     subtype:  #instep.arch  the arch of the foot
        subtype:  #sunken_arch__fallen_arch  an instep flattened so the entire sole rests on the ground
     subtype:  #shoulder_girdle__pectoral_arch  the bony arch formed by the collarbones and shoulder blades in humans
     subtype:  #hemal_arch__hemalarch__haemal_arch  a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels
     subtype:  #neural_arch__vertebral_arch__vertebralarch  a structure arising dorsally from a vertebral centrum and enclosing the spinal cord
  subtype:  #heel.skeletal_structure  the back part of the human foot
  subtype:  #girdle  an encircling or ringlike structure
     subtype:  #pectoral_girdle  a skeletal support to which the forelimbs of vertebrates are attached
     subtype:  #pelvis__pelvic_girdle__pelvic_arch__hip  the structure of the vertebrate skeleton supporting the lower limbs in humans and the hind limbs or corresponding parts in other vertebrates
  subtype:  #appendicular_skeleton  the part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbs
  subtype:  #axial_skeleton__axialskeleton  the part of the skeleton that includes the skull and spinal column and sternum and ribs
  subtype:  #spinal_column__vertebral_column__vertebralcolumn__spine__backbone__back__rachis  the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back"
     subtype:  #notochord  a flexible rodlike structure that forms the supporting axis of the body in the lowest chordates and lowest vertebrates and in embryos of higher vertebrates
        subtype:  #urochord  a notochord of a larval tunicate typically confined to the caudal region
     subtype:  #chine  backbone of an animal
  subtype:  #metacarpus  the part of the hand between the carpus and phalanges
  subtype:  #metatarsus  the skeleton of the human foot between the toes and the tarsus; the corresponding part of the foot in birds or of the hind foot in quadrupeds
  subtype:  #tarsus  the part of the foot of a vertebrate between the metatarsus and the leg; in human beings the bones of the ankle and heel collectively

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