What is the primary function of the masseter muscle?

• A. Elevates the mandible to close the jaw during chewing
• B. Protracts the tongue for swallowing
• C. Elevates the hyoid bone during swallowing
• D. Depresses the mandible to open the jaw

Answer: (A)

Verified step by step guidance

1. Identify the anatomical location and role of the masseter muscle. It is one of the main muscles involved in mastication (chewing).
2. Recall that the masseter muscle attaches to the mandible (lower jaw) and the zygomatic arch (cheekbone), allowing it to exert force on the mandible.
3. Understand the action of the masseter muscle: when it contracts, it pulls the mandible upward, which results in closing the jaw.
4. Compare this action with other muscles involved in swallowing or jaw movement, such as muscles that protract the tongue or elevate the hyoid bone, to distinguish the specific function of the masseter.
5. Conclude that the primary function of the masseter muscle is to elevate the mandible to close the jaw during chewing.