Which muscle fibers are primarily responsible for RETRUSION of the mandible?

Posterior temporalis fibers
Lateral pterygoid
Medial pterygoid
Anterior temporalis fibers

Show answer and explanation

Correct answer: A. Posterior temporalis fibers

POSTERIOR fibers of temporalis run nearly horizontally and pull the condyle posteriorly. Lateral pterygoid = protrusion. Masseter/medial pterygoid = elevation. Anterior temporalis = elevation and position maintenance.

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