The orbicularis oris is a circular muscle located around the mouth. It plays a crucial role in various facial movements, including closing the lips, puckering, and shaping the mouth for speech. This muscle is essential for actions like eating, drinking, and expressing emotions. As a key component of the facial muscles, the orbicularis oris is innervated by the facial nerve, which controls its movements. It helps in forming words and sounds, making it important for communication. Additionally, this muscle contributes to facial aesthetics and is involved in non-verbal expressions, such as smiling or frowning.