Facial muscles are a group of muscles that control facial expressions and movements. They are primarily responsible for actions such as smiling, frowning, and blinking. These muscles are unique because they are attached to the skin rather than bones, allowing for a wide range of expressions. The main facial muscles include the orbicularis oculi, which helps close the eyes, and the zygomaticus major, which is involved in smiling. These muscles are innervated by the facial nerve, making them essential for non-verbal communication and emotional expression.