#extremity.external_body_part  that part of a limb that is farthest from the torso
  supertype:  external_body_part  any body part visible externally
  subtype:  manus  finger  toe
  part of:  limb  one of the jointed appendages of an animal used for locomotion or grasping: arm; leg; wing; flipper
     part of:  appendicular_skeleton  the part of the skeleton that includes the pectoral girdle and the pelvic girdle and the upper and lower limbs
        part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

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