Which bone is not a part of the facial skull?

The frontal bone is not considered a part of the facial skull; rather, it is classified as part of the cranial skeleton. The facial skull comprises the bones that form the structure of the face and includes bones such as the zygomatic (cheekbone), lacrimal (bone forming part of the eye socket), and nasal bones (forming the bridge of the nose). These bones play essential roles in shaping the face, supporting the structure of the eyes, and housing the nasal cavities. In contrast, the frontal bone forms the forehead and the upper part of the eye sockets but does not contribute to the face's overall architecture, establishing its distinction from the facial bones.