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Retromolar Triangle Boundaries — MFDS Part 1 MCQ

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ModerateAnatomy (Head & Neck)Retromolar Triangle BoundariesMFDS Part 1

In a dentate adult mandible, which combination forms the bony boundaries of the retromolar triangle?

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Correct answer: B — Temporal crest, anterior border of the mandibular ramus, and distal aspect of the last mandibular molar

The retromolar triangle is a bony area immediately distal to the last mandibular molar. It is bounded medially by the temporal crest, laterally by the anterior border of the mandibular ramus and anteriorly by the distal aspect of the last molar or its alveolar margin. Therefore, B is correct. The mylohyoid line lies on the medial mandibular body and is not a boundary. The posterior ramal border and mandibular notch are too posterior or superior. Although the external oblique line is continuous with the anterior ramal region, it does not replace the complete set of boundaries in A. The mesial aspect of the last molar faces the dental arch rather than the retromolar area.

Reference: Törün O, Laçin N. Cone beam computed tomographic evaluation of temporal crest canal in the Turkish population. Surgical and Radiologic Anatomy. 2025;47:178. https://pubmed.ncbi.nlm.nih.gov/40696092/