Where is the maxillary tuberosity located?

• A. A rounded bony prominence located posterior to the maxillary third molars.
• B. The ridge along the alveolar crest of the maxilla.
• C. The root apex of the first molar.
• D. A part of the zygomatic arch.

Answer: (A)

The maxillary tuberosity is a rounded bony prominence on the posterior part of the maxilla, located just behind the last upper molar. This position behind the third molar is what defines it and makes it a key landmark, especially for procedures like posterior superior alveolar nerve blocks. It also forms the posterior boundary of the maxillary sinus, reflecting its relationship to the sinus floor.

In contrast, the ridge along the alveolar crest is the edge of the tooth-bearing part of the maxilla, not the tuberosity. The root apex of the first molar sits anterior to this area, not behind the last molar. The zygomatic arch is a separate cheekbone-like structure forming the lateral boundary of the orbit and the face, not a posterior maxillary prominence.