Arkansas Esthetician Practice Exam

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Which muscle is responsible for moving the corners of the mouth up and back, as in laughing?

  1. Buccinator

  2. Procerus

  3. Zygomaticus

  4. Epicranius

The correct answer is: Zygomaticus

Zygomaticus is the muscle that is responsible for lifting the corners of the mouth up and back, causing the expression of laughter. The other options are incorrect because they do not have the specific function of moving the corners of the mouth. The buccinator muscle is primarily responsible for compressing the cheeks, the procerus muscle moves the forehead and skin between the eyebrows, and the epicranius muscle is responsible for elevating the eyebrows.

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