The human face is a highly coordinated system of muscles that enables expression, communication, and essential protective reflexes. Among these, the orbicularis oculi and orbicularis oris—collectively referred to as the orbicularis muscles—play a central role. These circular muscles are responsible for eyelid closure and lip movement, respectively, and are critical for functions such as blinking, speech articulation, and food intake. What makes these muscles clinically significant is their exclusive innervation by the facial nerve (cranial nerve VII). Any disruption in this nerve’s function directly impacts orbicularis muscle performance, making them key indicator in neurological and neuromuscular assessments. Electromyography (EMG) offers...