Which bone is the upper jaw bone?

Which bone is the upper jaw bone?

• A. Maxilla
• B. Mandible
• C. Nasal
• D. Lacrimal

Answer: (A)

The upper jaw bone is the maxilla. It forms the upper dental arch, holding the upper teeth in the alveolar processes, and also contributes to the floor of the orbits and the sides of the nasal cavity, with the maxillary sinuses inside. The mandible, by contrast, is the lower jaw and is a separate bone that moves at the jaw joint. The nasal bones create the bridge of the nose, while the lacrimal bones are small bones at the inner corner of the eye that contribute to the medial wall of the orbit and the tear drainage area.

The upper jaw bone is the maxilla. It forms the upper dental arch, holding the upper teeth in the alveolar processes, and also contributes to the floor of the orbits and the sides of the nasal cavity, with the maxillary sinuses inside. The mandible, by contrast, is the lower jaw and is a separate bone that moves at the jaw joint. The nasal bones create the bridge of the nose, while the lacrimal bones are small bones at the inner corner of the eye that contribute to the medial wall of the orbit and the tear drainage area.