Which block would anesthetize the nasopalatine region?

• A. Nasopalatine nerve block
• B. PSA block
• C. Greater palatine block
• D. Infraorbital block

Answer: (A)

The idea being tested is which nerve block specifically targets the nasopalatine region by anesthetizing the anterior hard palate and the palatal gingiva of the maxillary incisors. The nasopalatine nerve, a branch of the maxillary division of the trigeminal nerve (V2), travels through the incisive canal to supply the mucosa of the anterior hard palate and the palatal gingiva from the maxillary canines to the central incisors. By injecting near the incisive foramen on the palatal side, you bathe this nerve as it passes through the canal, producing anesthesia of that anterior palatal area. The other blocks affect different regions: the PSA block targets the posterior maxillary teeth and surrounding tissues; the greater palatine block anesthetizes the posterior hard palate and palatal tissues beyond the canine region; the infraorbital block covers the anterior teeth and facial soft tissues but not the palatal mucosa. Therefore, the nasopalatine nerve block is the one that anesthetizes the nasopalatine region.