What areas are anesthetized in a nasopalatine nerve block?

• A. Anterior portion of the hard palate from canine to canine
• B. Posterior palatal mucosa behind the canines
• C. Buccal mucosa of the maxillary second molar
• D. Lips and gingiva of anterior teeth

Answer: (A)

The nasopalatine nerve block is aimed at anesthetizing the palatal tissue of the anterior hard palate, specifically the area between the canines. The nasopalatine nerve travels through the incisive canal to supply sensation to the mucoperiosteum and palatal gingiva in this region, so injecting at the incisive foramen numb the palatal mucosa from canine to canine.

This differs from areas supplied by other nerves: the posterior palatal mucosa behind the canines is served by the greater palatine nerve, not the nasopalatine nerve; the buccal mucosa of the maxillary second molar is supplied by other maxillary branches, not the NP nerve; and the lips and labial gingiva of the anterior teeth are mainly innervated by branches of the infraorbital nerve, not NP.