Superior view of isolated frontal bone. The frontal bone in the adult is a single bone having a horizontal or orbital portion that form the roofs of the orbit and nasal cavities and a larger vertical or squamous portion that forms most of the forehead. This bone unites along the coronal suture with the paired parietal bones and laterally with the zygomatic and greater wings of sphenoid. Along its posterior edge it articulates with lesser wings and body of the sphenoid. The U-shaped space in the posterior midline is the ethmoid notch for the cribriform plate of the ethmoid bone. The frontal lobes of the cerebrum rest upon its orbital surface. (Image courtesy of PA Rubino)