Winking requires contraction of which muscles?

Winking is a coordinated action that involves the eyelid, specifically requiring the contraction of both the palpebral and orbital portions of the orbicularis oculi muscle.

The palpebral portion primarily facilitates the gentle closing of the eyelids, which is essential during winking for a quick and controlled motion. On the other hand, the orbital portion contributes to a more forceful or complete closure of the eyelid when needed, such as during forceful blinks or when winking rapidly.

For a wink, the simultaneous activity of both muscle portions allows for a quick, efficient closure of the eyelid over the eye, enabling the characteristic motion of winking. This coordinated action supports proper communication through facial expressions, highlighting the importance of both components of the orbicularis oculi muscle in executing this function.