Which statement accurately describes the anterior nasal spine?

• A. It forms the boundary between the nasal cavity and the oral cavity.
• B. It is the posterior border of the maxillary sinus.
• C. It is a projection on the zygomatic arch.
• D. It is the junction of the lower part of the nasal septum and the inferior border of the nasal fossa.

Answer: (D)

The anterior nasal spine is a midline bony projection of the maxilla at the inferior border of the nasal aperture, and it marks the junction where the lower part of the nasal septum meets the floor of the nasal cavity (the inferior border of the nasal fossa). This location provides a stable anchor for the septal structure and serves as an important midline landmark for the nasal cavity. It is not the boundary between the nasal and oral cavities, not the posterior border of the maxillary sinus, and not a projection on the zygomatic arch.