Oral Surgery · single question
After an IANB, a patient develops trismus. Which muscle is most often involved?
Show answer and explanation
Correct answer: C. Medial pterygoid
- A. Incorrect – less commonly implicated in IANB trismus.
- B. Incorrect – a thin facial-expression muscle, not the cause of trismus.
- C. Correct – the needle passes near/through the medial pterygoid during an IANB; trauma/hematoma here is the classic cause of post-injection trismus.
- D. Incorrect – the masseter is not the structure penetrated during an IANB.