#arch.skeletal_structure  a curved bony structure supporting or enclosing organs (especially arches of the feet)
  supertype:  skeletal_structure  any structure created by the skeleton of an organism
  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

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