Which of the following is NOT a facial bone?

• A. Mastoid
• B. Maxilla
• C. Mandible
• D. Zygoma

Answer: (A)

The mastoid is an anatomical feature located on the temporal bone of the skull, specifically behind the ear. It is considered part of the cranial skeleton rather than the facial skeleton. In contrast, the maxilla, mandible, and zygoma are all classified as facial bones. The maxilla forms the upper jaw and part of the orbits, while the mandible is the lower jawbone, and the zygoma, also known as the cheekbone, contributes to the structure of the face. Therefore, identifying the mastoid as not being a facial bone is correct, as it does not participate in forming the facial structure but rather is associated with the skull.