INBDE (Integrated National Board Dental Examination) Practice Exam

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Which muscle is responsible for closing the eyes?

Orbicularis oculi
Levator palpebrae superioris
Lacrimalis
Risorius

The correct answer is: Orbicularis oculi

The orbicularis oculi muscle is responsible for closing the eyes. This muscle is present around the eyelids and is responsible for blinking and closing the eyes tightly. Levator palpebrae superioris is responsible for raising the upper eyelid, not closing the eyes. Lacrimalis is not a muscle, but a gland responsible for producing tears. Risorius is a facial muscle responsible for smiling, and is not involved in the function of closing the eyes. Therefore, the correct option is A, orbicularis oculi.