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 such as surprise or raising of the eyebrows in questioning. It also helps to wrinkle the skin of the forehead. This muscle is innervated by the temporal branch of the facial nerve. Its action is essential for non-verbal communication and conveying emotions. Weakness or paralysis of the frontalalis can result in a drooping eyebrow and affect the ability to express certain emotions. The frontalis muscle plays a role in facial aesthetics and is often considered in cosmetic procedures.