Someone winks (closes one eye) at you from across Thompson Library and walks your direction. You inform them that they just used what muscle to wink?

Question

BlackTom AI · Accepted Answer

Winking is produced by contraction of the orbicularis oculi muscle, a circular sphincter of the eyelids.

Relevant knowledge points: The orbicularis oculi is a facial (CN VII) muscle arranged concentrically around the orbit; it has two main parts—the palpebral part for gentle blinking and the orbital part for forceful eyelid closure. Voluntary unilateral contraction of this muscle closes one eyelid, which is precisely what occurs during a wink.

Step-by-step reasoning:
1. Identify the action described: closing one eyelid (a single-eye blink = wink).
2. Determine which muscle’s primary action is eyelid closure: the orbicularis oculi acts as the sphincter of the eyelids and produces both spontaneous and voluntary blinking.
3. Note the muscle’s parts: the palpebral portion produces quick, gentle blinks (typical of a wink) while the orbital portion produces tight, forceful closure.
4. Conclude that voluntary unilateral contraction of the orbicularis oculi on one side produces a wink.

Why the correct answer is correct: The orbicularis oculi directly performs eyelid closure; its anatomical position around the orbit and its ability to contract voluntarily on one side make it the muscle responsible for winking.

Why the other choices are incorrect:
- Platysma m.: superficial neck muscle that tenses skin of neck and depresses mandible/lower lip, not involved in eyelid movement.
- Frontalis m.: elevates eyebrows and wrinkles forehead; it opens the eyes (raises brows), not close them.
- Buccinator m.: cheek muscle that compresses the cheek against the teeth for mastication and blowing; does not move the eyelids.
- Orbicularis oris m.: circular muscle of the mouth that closes and protrudes lips, not involved with eyelids.

Conclusion: The correct muscle used to wink is Orbicularis oculi m., matching the provided answer.

Someone winks (closes one eye) at you from across Thompson Library and walks your direction. You inform them that they just used what muscle to wink?单项选择题

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