#membrane_bone  any bone that develops within membranous tissue without previous cartilage formation; e.g. the clavicle and bones of the skull
  supertype:  #bone__os  rigid connective tissue that makes up the skeleton of vertebrates
  subtype:  #frontal_bone__frontalbone__os_frontale__forehead  the large cranial bone forming the front part of the cranium: the forehead and the upper part of the orbits
  subtype:  #parietal_bone  either of two skull bones between the frontal and occipital bones and forming the top and sides of the cranium
  subtype:  #occipital_bone__occipitalbone  a saucer-shaped membrane bone that forms the back of the skull

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