The frontal bone forms the front portion of the skull above the eyes and includes the forehead, the roof of the nasal cavity, and the roofs of the orbits (bony sockets) of the eyes. On the upper margin of each orbit, the frontal bone is marked by a supraforamen (or supraorbital notch in some skulls), through which blood vessels and nerves pass to the tissues of the forehead. Within the frontal bone are two frontal sinuses, one above each eye near the midline.
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