frontalalis
The frontalalis is a muscle of the head located in the forehead. It is part of the occipitofrontalis muscle, a large, superficial muscle complex that covers the top and front of the skull. The occipitofrontalis is divided into two parts: the occipitalis and the frontalis. The frontalis portion originates from the galea aponeurotica, a tough, fibrous band that connects the frontalis and occipitalis muscles, and inserts into the skin of the eyebrows and the orbicularis oculi muscle.
The primary function of the frontalalis muscle is to elevate the eyebrows, which contributes to facial expressions