Anatomy & Histology · single question
What nerve should be anesthetized to treat tooth #15 (upper second molar)?
Show answer and explanation
Correct answer: D. Posterior superior alveolar (PSA) nerve
- A. The ASA nerve innervates the maxillary incisors and canines — not the molars.
- B. The MSA nerve innervates the maxillary premolars and the mesiobuccal root of the first molar — NOT the second molar.
- C. The infraorbital nerve provides sensory innervation to the anterior maxillary teeth and soft tissues — not the second molar.
- D. TOOTH #15 (maxillary left second molar) is innervated by the POSTERIOR SUPERIOR ALVEOLAR (PSA) nerve, which is a branch of the maxillary nerve (V2). The PSA nerve provides sensory innervation to the maxillary second and third molars (and typically the mesiobuccal root of the first molar). The PSA block is given into the pterygomaxillary space.
Practice Anatomy & Histology questions Anatomy & Histology study notes