#occipital_bone__occipitalbone  a saucer-shaped membrane bone that forms the back of the skull
  supertype:  membrane_bone  any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull
  part:  inion  occipital_protuberance
  part of:  cranium__braincase__brainpan  the part of the skull that encloses the brain
     part of:  skull  the bony skeleton of the head of vertebrates
        part of:  head__caput  the upper or front part of the body in animals; contains the face and brains; "he stuck his head out the window"
           part of:  animal__animate_being__animatebeing__beast__brute__creature__fauna  a living organism characterized by voluntary movement
        part of:  axial_skeleton__axialskeleton  the part of the skeleton that includes the skull and spinal column and sternum and ribs
           part of:  endoskeleton  the internal skeleton; bony and cartilaginous structure (especially of vertebrates)

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