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Figure 12. Upper face muscle pull on eyebrow. An illustration of the direction that each upper facial muscle pulls on the eyebrow,
showing the medial glabellar muscles exerting a downward force, the frontalis exerting an upward force, and the orbicularis oculi
exerting a downward force
Figure 13. Frontalis muscle anatomy. Facial muscle anatomy (top) and morphology, as seen with animation (bottom)
