Musculus occipitofrontalis is a part of musculus epicranius; the occipital belly (occipitalis muscle) arises from the occipital bone and inserts into the galea aponeurotica. The frontal belly (frontalis muscle) arises from the galea and inserts into the skin of the eyebrow and nose. Action: to move the scalp. Nerve supply: facial nerve. Synonym: occipitofrontal muscle.