Definition of frontal bone in English:

frontal bone


  • 1The bone which forms the front part of the skull and the upper part of the eye sockets.

    • ‘An external view of a skull shows a fracture near the bregma and scalping cuts along the frontal bone.’
    • ‘Unanimous skeletal features are few, but include a lack of contact between the squamosal and parietal bones in the skull and the presence of the frontal bone in forming the orbit.’
    • ‘A small vertical midline plate, termed the nasal spine of the frontal bone, contributes to the nasal septum.’
    • ‘Here we present a case of solitary plasmacytoma of frontal bone that was entirely asymptomatic.’
    1. 1.1 Either of the pair of bones from which the frontal bone is formed by fusion in infancy.
      • ‘Like tetrapods, but unlike all other fishes, they also have frontal bones in the skull roof.’
      • ‘In the individual with horns, the upper layer forming the horns can be separated from what appears to be the underlying normal frontal bones without obvious damage to either element.’
      • ‘The gap between the two frontal bones did not change significantly with gestation (mean: 1.5 mm; 5th centile: 1.0 mm; 95th centile: 2.0 mm).’
      • ‘They differ from other artiodactyl horns in that they do not project from the frontal bones, but lie over the sutures between the frontal and parietal bones.’
      • ‘Head lateral views showed focal increased uptake at both frontal bones and vertical enlargement of the diploe and mandibular bones.’