What is the path of insertion for a greater palatine nerve block?

• A. From opposite side of mouth at a right angle
• B. From the same side at a 45-degree angle to the occlusal plane
• C. From opposite side at a 45-degree angle
• D. From the buccal mucosa directly

Answer: (A)

The key idea is to place the needle so it arrives at the greater palatine foramen where the nerve exits onto the hard palate. The greater palatine nerve runs forward along the hard palate after it leaves the foramen, so delivering anesthetic from the opposite side of the mouth and directing the needle at a right angle to the palate lines up with the nerve’s course and allows the solution to bathe the nerve as it emerges. This contralateral, perpendicular approach reliably anesthetizes the posterior hard palate and palatal gingiva.

Approaching from the same side at a 45-degree angle or from the buccal mucosa would not align with the nerve’s path and would be less effective for blocking it.