Myokymia is the scientific term for the orbicularis oculi, a muscle that surrounds the eye and closes the eyelids, contracting involuntarily. The condition has been linked to stress, fatigue ...

"The 'jelly roll' area of the lower eyelid is anatomically called the pretarsal orbicularis oculi muscle, which is the area ...

More specifically, the orbicularis oculi muscles, which are responsible for opening and closing the eyelids, may spasm involuntarily and cause your upper or lower eyelid to twitch. This relatively ...

Discovered by French anatomist Duchenne de Boulogne in 1862, the key difference between this “real” happy smile and a “fake” happy smile lies in the orbicularis oculi – muscles that wrap ...