01 / Location & anatomical relationships
Along the ridge above each eye.
02 / Structure & organization
Eyebrow hairs emerge at angles that contribute to the contour above the orbit. Frontalis elevates the brow, while corrugator supercilii and nearby muscles draw it medially or downward. The underlying supraorbital margin belongs to the frontal bone.
03 / Function
They help guide sweat away from your eyes and help show feelings.
04 / Mechanism
The direction of eyebrow hairs helps guide moisture sideways. Muscles underneath can raise, lower or draw the brows together. These movements often accompany questions, concentration and other expressions.
Part of a bigger picture
The eyebrow belongs in our head & face collection. Explore the nearby parts to see how this area of the body fits together.
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Connect structure with function
Eyebrow position reflects coordinated muscular activity. Distinguish the hair-bearing eyebrow from the bony orbital rim and from the movable upper eyelid below it.
Check your understanding
Locate the eyebrow in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.