An instructor raises his eyebrows because he is very surprised by a student's comment in
class. Which of the following muscles is involved in his surprised expression?
A) corrugator supercilii
B) orbicularis oculi
D) depressor labii inferioris
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The correct answer here is C: occipitofrontalis muscle. This muscle attaches the occipital bone to the forehead and is used to raise the eyebrows. The orbicularis oculi muscle controls the eyelids. The corrugator supercilii muscle also controls the eyebrows but draws them down instead of up. The depressor labii inferioris muscle controls the bottom lip. And the buccinator muscle is located behind the cheek.
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