Which muscle is responsible for closing the lips?

The orbicularis oris muscle is primarily responsible for closing the lips. This muscle encircles the mouth, allowing for a range of movements that include pursing, closing, and protruding the lips. It plays a crucial role in activities such as speaking, eating, and facial expressions.

This muscle's unique circular arrangement around the mouth enables it to tighten and close the lips effectively. It is considered a key muscle in facial aesthetics and functionality, making it essential for diverse expressions and oral activities. Understanding the role of the orbicularis oris is fundamental in disciplines related to anatomy and facial musculature, particularly in professions such as mortuary science, where knowledge of human anatomy is crucial for preparation and presentation.