Oral Surgery · single question
Which landmark is used as the injection site reference for the inferior alveolar nerve block?
Show answer and explanation
Correct answer: B. Internal oblique ridge
- A. The coronoid notch helps orient the syringe barrel, but the actual target landmark is the internal oblique ridge.
- B. Correct. The internal oblique ridge (also called the temporal crest or mandibular lingula region) is the landmark for IAN block needle placement, with the injection directed medial to it.
- C. The external oblique ridge is on the buccal surface of the mandible — not the reference for IAN block placement.
- D. The pterygomandibular raphe is a visual landmark but the needle is directed laterally to it — not into it.