The epicranial aponeurosis is a fibrous tissue layer located on the top of the skull. It connects the frontalis muscle at the forehead to the occipitalis muscle at the back of the head. This structure plays a crucial role in the movement of the scalp, allowing for actions like raising the eyebrows and wrinkling the forehead. This aponeurosis is part of the scalp, which consists of five layers, often summarized as the "SCALP" acronym: Skin, Connective tissue, Aponeurosis, Loose areolar tissue, and Pericranium. The epicranial aponeurosis helps maintain the shape and integrity of the scalp during various facial expressions.