👉 The term "arrector" is a part of the human anatomy, specifically in the head and neck. It refers to the muscles that are responsible for opening and closing the eyes. The exact function of these muscles varies depending on which eye they control. In the case of an open eye (the left eye), the rectors are responsible for raising the eyelid above the eye socket. This is called "opening". They do this by contracting their muscles, causing the eyelids to rise slightly
