Which muscle is described as an elevator of the mandible and also participates in protrusion?

• A. Temporalis
• B. Masseter
• C. Medial Pterygoid
• D. Lateral Pterygoid

Answer: (C)

The key idea is how the muscles of mastication move the jaw together, not in isolation. The medial pterygoid is an elevator of the mandible, meaning its contraction raises the lower jaw. At the same time, its fibers and position allow it to contribute to forward movement of the mandible (protrusion) when it works in concert with the lateral pterygoid and other closers. In bilateral action, this muscle helps pull the mandible forward while elevating it, so it satisfies both tasks: elevating and participating in protrusion.

The other muscles don’t fit both roles as clearly. The lateral pterygoid is the primary protractor (forward-moving) but not an elevator. The temporalis mainly elevates the jaw and retracts it, rather than promoting protrusion. The masseter is a strong elevator and can assist with protrusion to some degree, but its protrusive role is not as central or consistent as that of the medial pterygoid in coordinated forward movement with the lateral pterygoid.