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: -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-3: -The corrugator supercilii muscle is a small, narrow, pyramidal muscle close to the eye. It arises from the medial end of the superciliary arch, and inserts into the deep surface of the skin of the eyebrow. It draws the eyebrow downward and medially, producing the vertical wrinkles of the forehead.

Detailed explanation-4: -The frontalis muscle (from Latin ‘frontal muscle’) is a muscle which covers parts of the forehead of the skull. Some sources consider the frontalis muscle to be a distinct muscle. However, Terminologia Anatomica currently classifies it as part of the occipitofrontalis muscle along with the occipitalis muscle.

Detailed explanation-5: -The occipitofrontalis is an interesting muscle. It is comprised of three sections: the frontalis, the occipitalis, and the galea aponeurotica. Each section is responsible for a different action involving the scalp, forehead, or brows.