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Radiology · single question

Panoramic shows a linear radiopaque structure in mandibular molar region. Most likely anatomical landmark?

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  1. Mylohyoid canal
  2. Nutrient canal
  3. External oblique ridge
  4. Internal oblique ridge (mylohyoid ridge)
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Correct answer: C. External oblique ridge

EXTERNAL OBLIQUE RIDGE (linea obliqua externa): dense radiopaque line extending obliquely from anterior border of ramus across molar region in panoramic. Landmark for IAN blocks and mandibular anatomy.

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