Which muscle surrounds the eye and controls squinting?

The muscle that surrounds the eye and is responsible for controlling actions such as squinting is the Orbicularis Oculi. This circular muscle plays a crucial role in closing the eyelids, allowing for actions like blinking and squinting, which protect the eyes from excessive light and assist in moisture retention.

The other muscles mentioned have different functions. The Orbicularis Oris, for example, is primarily involved in movements of the mouth, such as puckering the lips. The Frontalis muscle raises the eyebrows and wrinkles the forehead, and it does not have any role in eye movement. Zygomaticus Major is associated with elevating the corners of the mouth, contributing to expressions of joy or smiling, rather than controlling squinting or any actions related to the eyes. Thus, the specific capabilities of the Orbicularis Oculi make it the muscle involved in squinting.