Frontal belly of occipitofrontalis
The frontal belly of the occipitofrontalis (also known as frontalis, frontal part of occipitofrontalis, latin: venter frontalis musculi occipitofrontalis) is a paired facial muscle situated in the forehead region, which is one of two parts of the occipitofrontalis muscle. The frontal belly of the occipitofrontalis is connected with the occipital belly by the aponeurosis of epicranius.
The frontal belly of the occipitofrontalis originates from the galea aponeurotica (aponeurosis of the epicranius) and inserts into the skin of the eyebrow.
Upon contraction the frontal belly of the occipitofrontalis lifts the eyebrow and the upper eyelid, thus producing horizontal wrinkles of the forehead. Contractions of the muscle produce the facial expression of astonishment.
The frontal belly of the occipitofrontalis is innervated by the temporal branch of the facial nerve (CN VII).