Which of the following muscles belongs to the mouth?

• A. Buccinator and Pterygoid
• B. Pterygoid and Sternocleidomastoid
• C. Masseter and Sternocleidomastoid
• D. Buccinator and Levator

Answer: (A)

The mouth relies on muscles that shape the lips and cheeks and that move the jaw for chewing. The buccinator sits in the cheek and helps compress the cheek against the teeth, guiding food toward the grinding surfaces and keeping it between the teeth during chewing. The pterygoid muscles are deeper jaw muscles that drive the movements of the mandible—opening, closing, and grinding—directly affecting how the mouth works during chewing. Together, these two muscles cover the key actions needed for mouth function: manipulating food inside the mouth and producing the jaw movements that chew. The other options mix in muscles not primarily involved in mouth actions (like neck muscles) or pair muscles in a way that doesn’t clearly reflect mouth function.