Frontalis muscle/العضلات الجبهية/muscle frontal

The frontalis is actually a single muscle that spans the width of your forehead, above your eyebrows.

The frontalis is one of the muscles of facial expression and plastic surgeons inject botulism toxin, or Botox, into this muscle to keep it the forehead smooth and reduce the appearance of fine lines.

You often use this muscle without thinking, such as when surprised or worried, but you can also use the frontalis muscle voluntarily.

Step 1

Sit or stand in front of the mirror. The mirror allows you to observe your facial expressions.

Step 2

Raise and lower your left eyebrow to use left side of the frontalis muscle. If you cannot isolate the left eyebrow, gently press your palm against your right eyebrow to immobilize that part of the muscle.

Step 3

Raise and lower your right eye brow to use right side of the frontalis muscle. If you cannot isolate the right eyebrow, gently press your palm against your left eyebrow to immobilize that part of the muscle.

Step 4

Raise and lower both your eyebrows to use the entire frontalis muscle. Your brow should wrinkle with several furrows across the width of your brow.

Its medial fibers are continuous with those of the Procerus; its immediate fibers blend with the Corrugator and Orbicularis oculi, thus attached to the skin of the eyebrows; and its lateral fibers are also blended with the latter muscle over the zygomatic process of the frontal bone.

In the eyebrows, its primary function is to lift them (thus opposing the orbital portion of the orbicularis), especially when looking up.

It also acts when a view is too distant or dim.

From these attachments the fibers are directed upward, and join the galea aponeurotica below the coronal suture.

The medial margins of the Frontales are joined together for some distance above the root of the nose; but between the Occipitales there is a considerable, though variable, interval, occupied by the galea aponeurotica.

It could be part of occipitofrontalis muscle.

Frontalis is innervated by temporal branches of the facial nerve (VII) and is supplied with blood by the superficial temporal artery.

The inner frontalis is the medial part of the frontalis muscle. Its contraction raises the medial part of the brow and eyebrows, forming slanted wrinkles in the forehead and creating a slant up towards the center in the eyebrows.

the inner brows are raised by the inner frontalis muscle

The outer frontalis is the lateral part of the frontalis muscle. Its contraction raises the lateral (outer) part of the brow and eyebrows, forming wrinkles in the lateral part of the forehead and an arched shape to the eyebrows.