Which eyebrow muscle draws the eyebrow down and wrinkles the forehead vertically?

Which eyebrow muscle draws the eyebrow down and wrinkles the forehead vertically?

• A. Procerus
• B. Frontalis
• C. Corrugator Supercilii
• D. Orbicularis Oculi

Answer: (A)

The action being tested is how specific facial muscles move the eyebrow and forehead to create expressions. The procerus inserts into the skin near the glabella and, when it contracts, pulls the medial part of the eyebrow downward. This downward pull plus the way the skin bunches in the mid-forehead region produces vertical wrinkling in the center of the forehead. So this muscle best fits the description of drawing the eyebrow down and creating vertical forehead wrinkles. In contrast, the frontalis raises the brows to form horizontal forehead creases, the corrugator supercilii pulls the brows together and downward to form vertical frown lines between the brows, and the orbicularis oculi mainly closes the eyelids.

The action being tested is how specific facial muscles move the eyebrow and forehead to create expressions. The procerus inserts into the skin near the glabella and, when it contracts, pulls the medial part of the eyebrow downward. This downward pull plus the way the skin bunches in the mid-forehead region produces vertical wrinkling in the center of the forehead. So this muscle best fits the description of drawing the eyebrow down and creating vertical forehead wrinkles. In contrast, the frontalis raises the brows to form horizontal forehead creases, the corrugator supercilii pulls the brows together and downward to form vertical frown lines between the brows, and the orbicularis oculi mainly closes the eyelids.