Which muscle elevates the mandible and brings the teeth into contact (without noting closing movements)?

Which muscle elevates the mandible and brings the teeth into contact (without noting closing movements)?

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

Answer: (B)

The key idea is which muscle provides the primary force to bring the teeth together and close the jaw. The masseter is the strongest elevator of the mandible, attaching from the zygomatic arch to the mandible, so its contraction lifts the lower jaw upward and directly brings the upper and lower teeth into occlusal contact. While the temporalis also helps close the jaw and can retract the mandible, its main role isn’t as focused on producing the occluding bite as the masseter. The medial pterygoid assists in elevation and works with the masseter during grinding, but it isn’t the primary driver of occlusion. The lateral pterygoid, on the other hand, is involved in opening the jaw and protrusion, not in bringing the teeth together for contact. So the masseter best fits the action of elevating the mandible to achieve occlusion.

The key idea is which muscle provides the primary force to bring the teeth together and close the jaw. The masseter is the strongest elevator of the mandible, attaching from the zygomatic arch to the mandible, so its contraction lifts the lower jaw upward and directly brings the upper and lower teeth into occlusal contact. While the temporalis also helps close the jaw and can retract the mandible, its main role isn’t as focused on producing the occluding bite as the masseter. The medial pterygoid assists in elevation and works with the masseter during grinding, but it isn’t the primary driver of occlusion. The lateral pterygoid, on the other hand, is involved in opening the jaw and protrusion, not in bringing the teeth together for contact. So the masseter best fits the action of elevating the mandible to achieve occlusion.