Anatomy & Histology · single question
Which anatomic structure serves as the primary landmark for the inferior alveolar nerve block technique?
Show answer and explanation
Correct answer: B. Pterygomandibular raphe
The pterygomandibular raphe is the primary anatomic landmark for the inferior alveolar nerve (IAN) block. The needle is directed just lateral and parallel to the raphe, aiming toward the medial surface of the ramus where the mandibular foramen is located. Visualizing the raphe guides depth and direction of insertion.
- A. ❌ The retromolar pad is posterior and inferior — not used as the primary IAN block landmark.
- B. ✅ CORRECT – The pterygomandibular raphe is the key landmark for the IAN block; the needle is placed just lateral to it.
- C. ❌ The coronoid notch helps identify the height of injection (deepest concavity of the anterior ramus), but the raphe is the primary soft-tissue landmark.
- D. ❌ The external oblique ridge is on the lateral surface of the ramus and is not used for the IAN block.
Practice Anatomy & Histology questions Anatomy & Histology study notes