Which facial muscle is primarily responsible for raising the eyebrows?

• A. Buccinator
• B. Orbicularis oculi
• C. Frontalis (frontal belly of the occipitofrontalis)
• D. Zygomaticus major

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the function of each muscle listed. The Buccinator muscle is primarily involved in compressing the cheek, important for actions like blowing or chewing.
2. Step 2: Recognize that the Orbicularis oculi muscle encircles the eye and is responsible for closing the eyelids, not raising the eyebrows.
3. Step 3: Identify the Frontalis muscle (frontal belly of the occipitofrontalis) as the muscle that elevates the eyebrows and wrinkles the forehead, which is key for expressions of surprise or curiosity.
4. Step 4: Note that the Zygomaticus major muscle is involved in elevating the corners of the mouth, contributing to smiling, rather than moving the eyebrows.
5. Step 5: Conclude that the muscle primarily responsible for raising the eyebrows is the Frontalis muscle, based on its anatomical position and function.