GROSS ANATOMY

Detailed explanation-1: -The frontal belly of the occipitofrontalis (Latin: venter frontalis musculi occipitofrontalis), also known as the frontalis, is a paired facial muscle situated in the forehead region. This muscle covers the upper anterior aspect of the skull.

Detailed explanation-2: -Purpose: Occipital belly (OB) of occipitofrontalis muscle (epicranius) is a muscle which covers the occipital part of the skull. The posterior auricular nerve (PAN) is the first extracranial branch of the facial nerve, which supplies the OB.

Detailed explanation-3: -The occipital belly of the occipitofrontalis originates from the superior nuchal line of the occipital bone.

Detailed explanation-4: -The bellies are connected by a thick fibrous sheath called epicranial aponeurosis (galea aponeurotica) onto which both of them attach. The function of occipitofrontalis muscle is to elevate the eyebrows and wrinkle the forehead skin with its frontal part, and to retract the scalp with its occipital part.