Anatomy & Histology · single question
Which muscle is primarily responsible for trismus?
Show answer and explanation
Correct answer: C. Medial pterygoid
The medial pterygoid is specifically associated with trismus. It is a jaw-closing muscle whose spasm results in limited opening.
- A. ❌ Temporalis elevates and retracts the mandible; medial pterygoid is highlighted.
- B. ❌ Masseter also closes the jaw and can contribute to trismus but the source identifies medial pterygoid.
- C. ✅ CORRECT – Medial pterygoid spasm causes trismus.
- D. ❌ Lateral pterygoid is a jaw-opener; its spasm causes a different type of limited opening.
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