21. A 23-year-old man is brought to the emergency department because of pain in his left cheekbone area following a blow to his face in a fight at work 1 hour ago. Physical examination shows exquisite tenderness, swelling, and ecchymosis over the left cheek. A CT scan shows a displaced complex fracture of the left zygomatic arch. The fracture site is surgically explored and reduced. Tension by which of the following muscles has the greatest potential to displace the surgically reduced fracture in this patient? A) Buccinator B) Lateral pterygoid C) Masseter D) Medial pterygoid
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