Anatomy & Histology · single question
Which nerve may provide accessory innervation to mandibular molars when an IANB (inferior alveolar nerve block) fails?
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Correct answer: A. Mylohyoid nerve
- A. Correct. The mylohyoid nerve (a branch of the inferior alveolar nerve given off before it enters the mandibular canal) can provide accessory sensory innervation to mandibular molars in some patients, explaining occasional IANB failures.
- B. The lingual nerve supplies the tongue/lingual soft tissue, not accessory innervation to the molar pulps.
- C. The buccal nerve supplies buccal soft tissue, not pulpal innervation.
- D. The mental nerve supplies the chin/lower lip region, distal/unrelated to molar pulpal innervation.
Note: Supplemental block or intraosseous injection may be needed when IANB fails due to mylohyoid accessory innervation.
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