The frontal bone is a flat bone located at the front of the skull. It forms the forehead and the upper part of the eye sockets, providing structure and protection for the brain. This bone is crucial for the shape of the face and plays a role in the formation of the nasal cavity. In infants, the frontal bone is initially composed of two separate halves that fuse together as they grow. This fusion typically occurs by the age of 6, resulting in a single bone. The frontal bone also contains the frontal sinuses, which are air-filled spaces that help reduce the weight of the skull and contribute to voice resonance.