How many branches does the PSA nerve have?

How many branches does the PSA nerve have?

• A. One
• B. Two
• C. Three
• D. Four

Answer: (B)

The PSA nerve typically divides into two main branches after it enters the posterior maxilla. These two branches spread to innervate the posterior teeth in that region, including the molars, and also give off gingival and sometimes sinus branches as they course through the area. This two-branch pattern is the standard description you’ll see in anatomy references and is why the correct answer is two. There can be anatomical variation where a third smaller branch is present in some individuals, or connections to other nerves occur, but the two-branch arrangement is the most commonly described pattern and forms the basis for how a PSA block is planned to achieve molar anesthesia.