INBDE (Integrated National Board Dental Examination) Practice Exam

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What muscle opens the upper eyelid?

  1. Orbicularis oculi

  2. Corrugator supercilii

  3. Levator palpebrae superioris

  4. Procerus

The correct answer is: Levator palpebrae superioris

The muscle that opens the upper eyelid is the Levator palpebrae superioris. This muscle is responsible for elevating the upper eyelid and allowing the eye to open. The Orbicularis oculi is responsible for closing the eyelid, the Corrugator supercilii is responsible for wrinkling the forehead, and the Procerus muscle is responsible for causing horizontal wrinkles on the bridge of the nose.

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