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RESEARCH.

FRONTALIS.

                The Frontalis lifts the eyebrows straight up the forehead, creating a small network of wrinkles that we mainly identify as 'worry lines.' (see fig .06)  It contributes to the expression of surprise, fear and sadness.  It is a broad, flat muscle that lies across the entire width of the forehead.  (see fig .07)  It's muscle fibers run vertically, dropping from the hairline, where they are held in place, to it's unconnected end, the skin underneath the eyebrows.  When the frontalis contracts, all the skin just above the eyes and nose is pulled straight up towards the hairline, with eyebrows pulled up also.
                As the forehead rises, the skin caught in the way gathers into horizontal creases.  Some people exhibit no crease lines.  Others have maybe half a dozen or more, fairly evenly spaced, but the creases will never exactly be straight.  Typically, they will have a long dip in the middle, as they near the side of the forehead, they will suddenly change direction, curve sharply downward and die out.  When the lift of the brow is only partial, fewer wrinkles, and fewer complete ones, will appear.

                   Fig . 07  Frontalis - Sheet muscle.

Fig . 06 - Frontalis in action.