Which muscle is responsible for eyelid closure?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which muscle is responsible for eyelid closure?

Explanation:
Closing the eyelids is done by the orbicularis oculi, a circular facial muscle that surrounds the eye. When it contracts, it pulls the eyelids together to seal the opening. The orbital part provides a tight closure, while the palpebral part allows a softer blink. The levator palpebrae superioris, in contrast, elevates and opens the upper lid. Glands of Zeiss are sebaceous glands associated with eyelashes, and the conjunctiva is the mucous membrane lining the eyelids and eyeball—neither is involved in closing the lids.

Closing the eyelids is done by the orbicularis oculi, a circular facial muscle that surrounds the eye. When it contracts, it pulls the eyelids together to seal the opening. The orbital part provides a tight closure, while the palpebral part allows a softer blink. The levator palpebrae superioris, in contrast, elevates and opens the upper lid. Glands of Zeiss are sebaceous glands associated with eyelashes, and the conjunctiva is the mucous membrane lining the eyelids and eyeball—neither is involved in closing the lids.

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