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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BlackTom AI · Accepted Answer

Situation: You approached a friend from behind at Thompson Library, they raised their eyebrows in surprise, and you’re asking which muscle raised the eyebrows. 
Option 1: Buccinator m. — The buccinator is the cheek muscle involved in pressing the cheek against teeth (as in whistling or blowing), not in eyebrow movement. This option is incorrect for eyebrow elevation.
Option 2: Platysma m. — The platysma runs in the neck and tenses the skin of the neck and lower face; it does not lift the eyebrows. This option does not explain eyebrow elevation.
Option 3: Frontalis m. — The frontalis muscle covers the forehead and is responsible for raising the eyebrows and creating horizontal forehead lines, which aligns with raising eyebrows in surprise. This option correctly identifies the muscle involved in eyebrow elevation.
Option 4: Orbicularis oculi m. — This circular muscle around the eye closes the eye (blinking, squinting) rather than lifting the eyebrows. While it can participate in expressions near the eyes, it is not the primary muscle rising the eyebrows. This option is incorrect for eyebrow elevation.
Option 5: Orbicularis oris m. — The orbicularis oris encircles the mouth and controls movements of the lips; it does not affect eyebrow position. This option is not related to eyebrow raising.
In summary, the action described—raising the eyebrows—is primarily performed by the frontalis muscle, with other muscles contributing to related expressions but not responsible for eyebrow elevation itself. The remaining muscles listed have roles in cheek, neck tensing, eyelid closure, or mouth movements, making them unsuitable explanations for the observed eyebrow lift.

ANATOMY 2300 AU2025 (34636) Unit 4 Exam - Requires Respondus LockDown Browser

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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