ANATOMY

Detailed explanation-1: -Frontalis muscle – lifts the eyebrows, makes horizontal forehead wrinkles when we are surprised. Orbicularis oculi – the circular muscle of the eye (consists of two muscles).

Detailed explanation-2: -Occipitofrontalis, a muscle that extends from your eyebrows to the top of your skull that can raise your eyebrows and wrinkle your forehead.

Detailed explanation-3: -The orbicularis oris muscle contributes to the form and shape of the lips. Contraction of this muscle closes and protracts the lips (Fig. 2.13). The position and movement of the lips is acted upon by several mimetic muscles that elevate and depress the lips.

Detailed explanation-4: -The frontalis muscle is responsible for elevating the eyebrows, while the corrugator supercilii, orbicularis oculi, and procerus play a role in its depression. The function of the forehead is often spared in middle cerebral artery strokes.