What is the location of the orbicularis oris muscle?

The orbicularis oris muscle is situated around the mouth and forms the majority of the lips. This circular muscle plays a critical role in various functions, including the movements of the lips during speech, eating, and facial expressions. Its positioning allows for the closing, pursing, and protruding of the lips, making it essential for tasks such as kissing, whistling, or holding objects between the lips. Understanding the anatomy of this muscle is crucial in dental nursing as it relates to procedures involving the mouth and facial aesthetics. The other choices refer to areas of the face and structures that do not encompass the function or location of the orbicularis oris muscle.