Which of the following is NOT a facial bone?

The cranium is not classified as a facial bone; it comprises the skull's upper part which houses and protects the brain. The cranial bones include structures like the frontal, parietal, occipital, temporal, and sphenoid bones, all of which contribute to the protective casing for the brain rather than the facial structure.

In contrast, the mandible, maxilla, and nasal bones are indeed facial bones. The mandible forms the lower jaw and is the only movable bone of the skull. The maxilla comprises the upper jaw and holds the upper teeth, while the nasal bones form the bridge of the nose. Understanding the distinct roles of these bone groups is crucial for comprehending human anatomy.