The occipitofrontalis is a muscle that covers the top and back of the skull and is responsible for movements of the forehead and scalp. It consists of two main parts: the frontal belly, which raises the eyebrows and wrinkles the forehead, and the occipital belly, which helps pull the scalp back. This muscle plays a key role in facial expressions, particularly in conveying surprise or curiosity. Overall, it aids in the overall mobility and expression of the forehead and scalp areas.