Tutorial 134 - Occipitofrontalis (Patreon)

The occipitofrontalis muscle runs from the front of the skull (the frontalis, as illustrated) across the scalp as a tendon, to the back of the skull (the occipitalis).

The muscle is for expression only, raising the eyebrow from two areas, the medial fibers pull the outer corners of the eyebrows and the lateral fibers work the inner corners. 

They work separately or together to express sadness, surprise or a quizzical look.