You're meeting a friend at Thompson Library and you approach them from behind. They didn't see you so they raise their eyebrows in surprise. You inform them that they just used what muscle to raise their eyebrows?

Question

BlackTom AI · Accepted Answer

In this scenario, the social cue is raising the eyebrows, which is a common expression of surprise. Now let's examine each option to see which muscle is responsible for that action.

Option 1: Frontalis m. — The frontalis muscle runs over the forehead and is the primary muscle that elevates the eyebrows, causing the horizontal forehead wrinkles associated with surprise or attention. This description aligns exactly with the action described.

Option 2: Orbicularis oris m. — This circular muscle encircles the mouth and functions to purse the lips and compress the mouth, as in actions like whistling or kissing. It does not elevate the eyebrows, so it doesn’t explain the described surprise gesture.

Option 3: Platysma m. — The platysma is a superficial neck muscle that tends to tighten the skin of the neck and can pull the lower jaw downward slightly or express tension in the neck. It is not involved in eyebrow elevation and thus not responsible for raising the eyebrows.

Option 4: Orbicularis oculi m. — The orbicularis oculi closes the eyelids tightly (as in blinking or squinting). While it operates around the eye, it does not lift the eyebrows. Eyebrow elevation is primarily performed by the frontalis, not this muscle.

Option 5: Buccinator m. — The buccinator forms part of the cheek wall and helps with compressing the cheek against teeth during chewing and is important for blowing air out of the mouth. It does not elevate the eyebrows, so it’s unrelated to the described action.

Putting these observations together, the muscle responsible for raising the eyebrows in this context is the frontalis muscle, while the other muscles listed have different primary actions related to the mouth, neck, or eyelids and do not elevate the eyebrows.

You're meeting a friend at Thompson Library and you approach them from behind. They didn't see you so they raise their eyebrows in surprise. You inform them that they just used what muscle to raise their eyebrows?

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