What is Frontalis?
It is a thin, quadrilateral muscle which is intimately adherent to superficial fascia and has no bony attachments. It is sometimes considered to be a part of the occipitofrontalis muscle.
These muscles are located at the front of the head.
The muscle originates at the galea aponeurotica.
Frontalis is broader than the Occipitalis muscle. The fibers of this muscle are longer and paler as compared to that of the Occipitalis muscle. The medial fibers of Frontalis are continuous with the medial fibers of Procerus. The immediate fibers of this muscle blend with Orbicularis oculi and Corrugator and are attached to the skin of eyebrows. The lateral fibers of Frontalis are blended with latter muscle over the Zygomatic process of frontal bone. The fibers of Frontalis muscle are then directed upwards where they join galea aponeurotica below the coronal suture.
The primary function of this muscle is to help an individual lift his or her eyebrows up, especially when he or she is looking up. It also helps an individual to adjust his or her vision when the view is too dim or distant.
The following images show the location of this muscle.
Picture 1 – Frontalis
Picture 2 – Frontalis Image