The maxillary tuberosity is best described as which of the following?

• A. A rounded eminence on the inferior posterior surface of the maxilla
• B. A rounded eminence on the anterior surface of the maxilla
• C. A hollow behind the maxillary sinus
• D. A crest along the orbital rim

Answer: (A)

The maxillary tuberosity is a rounded bony bump at the back of the upper jaw, located on the posterior aspect of the maxilla just behind the last molar. It sits toward the inferior-posterior part of the bone and over lies the posterior wall of the maxillary sinus. This placement makes it a distinct, palpable eminence behind the molars, which is why describing it as a rounded eminence on the inferior posterior surface of the maxilla fits best.

The other ideas don’t describe this structure: it is not on the front (anterior surface), not a hollow behind the maxillary sinus (that would be the sinus itself), and not a crest along the orbital rim. This tuberosity is an important landmark in maxillary anesthesia because injections around this area relate to the posterior superior alveolar region and the sinus wall.