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