The forehead muscle

What it does

The frontalis is a thin sheet of muscle across the forehead. It pulls the eyebrows up, creating horizontal forehead lines when you look surprised or curious. It is joined by a sheet of tendon over the scalp to the occipitalis at the back.

Why it matters

Cosmetic injections that smooth forehead lines work by weakening this muscle, which is why too much can leave eyebrows that can't move.

Nearby

• The back-of-scalp muscle
• The forehead bone
• The blinking muscle
• The facial nerve

Read more

• Frontalis — Wikipedia