Superciliary arch: anatomy beneath the eyebrow
- Highlighted area
Quick facts
- Definition
- Rounded prominence of the frontal bone above the orbit, under the inner part of the eyebrow.
- Location
- Above the upper orbital rim, more medial; the two arches approach each other at the glabella.
- Anatomical basis
- Its volume depends on the frontal bone and, in part, on the frontal sinus just behind it.
- Dimorphism
- Generally more prominent in adult men and softer in women.
- Relevance in facial harmonization
- Shapes the shadow of the forehead, the perceived position of the eyebrow, and the masculine or feminine read of the upper third.
The superciliary arch is the rounded prominence of the frontal bone located above the orbit, under the inner part of the eyebrow. It sits above and slightly medial to the upper edge of the orbit, and the two arches, right and left, approach each other at the glabella. Its volume depends on the bone and, in part, on the frontal sinus just behind it. It is generally more pronounced in adult men, which makes it one of the features that distinguish the male forehead from the female one.
Superciliary arch and orbital rim: what is the difference?
| Structure | Where it is | What it defines |
|---|---|---|
| Superciliary arch | Frontal bone, above and medial to the orbital edge | Prominence under the head and body of the eyebrow |
| Supraorbital margin | The upper edge of the orbit itself | Frame of the eye; has the supraorbital notch or foramen |
| Glabella | Flat or slightly prominent area between the two arches | Center of the forehead, above the root of the nose |
The supraorbital margin is part of the orbital rim. In a living person, the two structures add up to the touch and in the shadow of the forehead, but they are described separately in anatomy.
Why does the superciliary arch matter in facial harmonization?
- Masculine and feminine read: in men, the forehead usually has more prominent arches, and a lower, straighter eyebrow resting on the orbital edge. In women, the forehead is smoother and the eyebrow usually sits slightly above the edge, with a more lateral arch. The topic appears in male orofacial harmonization.
- Shadow and gaze: a prominent arch casts a shadow over the eyes and can make the gaze look deeper-set or sterner. A barely marked arch leaves the forehead flatter.
- Glabellar muscles: the corrugator muscle originates from the bone at the medial part of the arch. Its position helps explain the pattern of the lines between the eyebrows.
- Limit of injectables: because it is bone, the arch does not change with filler or toxin. What changes is the relationship between the eyebrow, the forehead and fat pads such as the ROOF.
How does it show up in the assessment?
- Profile and three-quarter views: show the projection of the arch relative to the glabella and the root of the nose.
- Light from above: emphasizes the shadow over the eyes.
- Palpation: separates bony prominence from soft tissue volume.
- Eyebrow position: note whether it sits over the arch, above it or below it, at rest and when raising the forehead with the frontalis muscle.
- Expectations: a patient who wants to soften a prominent arch needs to hear that injectables do not reduce bone.
Also called: superciliary arches, arcus superciliaris, brow ridge, supraorbital ridge (popular use).
Frequently asked questions
Are the superciliary arch and the supraorbital ridge the same thing?
In everyday use, many people call the prominence above the eyes the supraorbital ridge. In anatomy, the superciliary arch is the elevation of the frontal bone above and medial to the orbital edge, and the supraorbital margin is the edge itself. In modern humans there is no continuous ridge as in other primates.
Can the superciliary arch be reduced with injectables?
No. The superciliary arch is bone. Injectables add volume or relax muscles and can change how the surrounding area is perceived, but they do not reduce bony prominence. Reducing the frontal bone is a matter for surgical assessment.