ANATOMY

Detailed explanation-1: -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.

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. Orbicularis oculi, which closes your eyelids.

Detailed explanation-3: -The frontalis muscles are a pair of vertically oriented muscles in the forehead that lift the eyebrows. When one contracts the forehead muscle it causes elevation of the brows with simultaneous development of horizontal wrinkles in the forehead.

Detailed explanation-4: -There are two muscles, one on each side of the forehead, with a central gap in-between. This forehead muscle blends with the other muscles in-between the eyebrows and nose, including the orbicularis oculi, corrugator, and procerus muscles. The frontalis muscle elevates the eyebrow and is involved with expression.

Detailed explanation-5: -The only elevator of the forehead is the frontalis muscle, so chemical paralysis of the frontalis without treatment of the three depressors (orbicularis oculi, corrugator, and procerus) may lead to brow descent.