The epicranius is a muscle located on the top of the skull. It consists of two main parts: the frontalis, which is at the forehead, and the occipitalis, found at the back of the head. This muscle plays a crucial role in facial expressions, particularly in raising the eyebrows and wrinkling the forehead. The epicranius is connected to the galea aponeurotica, a fibrous tissue that stretches across the top of the skull. It is innervated by the facial nerve, which controls the movement of facial muscles. Understanding the epicranius is important in fields like anatomy and cosmetic surgery.