The occipitofrontalis (also known as the epicranius muscle) is a facial muscle of the calvaria region consisting of paired occipital and frontal bellies, which are connected to each other by the epicranial aponeurosis.
Occipital belly (Occipitalis muscle)
Insertion: galea aponeurotica (also known as epicranial aponeurosis).
Action: moves the scalp posteriorly.
Innervation: posterior auricular nerve, a branch of the facial nerve (CN VII).
Frontal belly (Frontalis muscle)
Origin: galea aponeurotica.
Insertion: skin of the eyebrow.
Action: lifts the eyebrow and the upper eyelid, thus producing horizontal wrinkles of the forehead. Contractions of the muscle produce the facial expression of astonishment.
Innervation: temporal branch of the facial nerve (CN VII).
Blood supply: branches of the superficial temporal and ophthalmic arteries.