Anatomy & Histology · single question
Due to the drooling, which muscle is primarily affected?
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Correct answer: C. Orbicularis oris
- A. The masseter (CN V3) elevates the mandible and is not a facial-expression muscle controlling lip seal.
- B. The buccinator keeps food on the occlusal table; weakness contributes but the lip-seal failure is orbicularis.
- C. Correct. The orbicularis oris (CN VII) seals the lips; facial-nerve palsy weakens it, causing drooling.
- D. Levator anguli oris elevates the corner of the mouth, not the primary lip-seal/competence muscle.
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