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Oral Surgery · single question

A patient has a lesion on the LOWER LIP requiring a biopsy. Which arteries supply the LOWER LIP?

  1. Infraorbital artery
  2. Facial artery only
  3. Inferior labial artery AND mental artery
  4. Superior labial artery only
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Correct answer: C. Inferior labial artery AND mental artery

  • A. Infraorbital artery supplies the cheek and upper lip region below the eye.
  • B. Facial artery branches into both superior and inferior labial arteries — stating 'facial artery only' is incomplete.
  • C. Correct. The LOWER LIP has a dual blood supply: (1) INFERIOR LABIAL ARTERY (branch of the facial artery) — supplies the main body of the lower lip, (2) MENTAL ARTERY (terminal branch of the inferior alveolar artery, exits through the mental foramen) — supplies the chin and lower lip region. Knowledge of this vascular supply is important for designing flaps and managing bleeding during biopsies of lower lip lesions.
  • D. Superior labial artery supplies the UPPER lip.

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