What is the function of the superior head of the lateral pterygoid during chewing?

• A. It helps stabilize the mandible during clenching
• B. It stabilizes the mandible by limiting lateral movement
• C. It helps control disc position and assists with opening and protrusion, stabilizing the joint
• D. It controls jaw closing power

Answer: (C)

The superior head of the lateral pterygoid is geared toward managing the disc and stabilizing the joint during jaw movements. Because it attaches to the articular disc and the joint capsule, it pulls the disc forward as the mandible opens and during protrusion, helping the disc-condyle relationship stay aligned as the jaw translates. This disc-control function, plus assisting opening and forward movement, is exactly what keeps the TMJ stable and coordinated during chewing, making it the best description of its role. The other options describe functions more tied to jaw closing power or limiting lateral movement, which involve different muscles or the inferior head rather than the disc-focused action of the superior head.