INBDE (Integrated National Board Dental Examination) Practice Exam

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Which facial expression muscle acts as the mouth sphincter?

  1. Zygomaticus major

  2. Orbicularis oris

  3. Buccinator

  4. Masseter

The correct answer is: Orbicularis oris

The facial expression muscle that acts as the mouth sphincter is the Orbicularis oris. This muscle is a circular muscle that surrounds the mouth and is responsible for closing and puckering the lips. It plays a crucial role in functions such as speaking, eating, and facial expressions involving the mouth. The other options, such as the Zygomaticus major, Buccinator, and Masseter, are facial muscles with different functions. The Zygomaticus major is responsible for raising the corners of the mouth when a person smiles, the Buccinator muscle helps in sucking and blowing actions as well as keeping food in place while chewing, and the Masseter muscle is involved in the elevation and closing of the jaw.

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