eyebrow

Eyebrows are ridges of skin covered with hair located above the eyes. They serve a dual purpose: protection and communication.

Eyebrows act as a physical barrier, diverting sweat, rain, and dust away from the eyes, thus safeguarding vision. Their shape and the direction of hair growth help channel moisture to the sides of the face. Additionally, they can provide shade from the sun's glare by projecting forward like a small roof.1

Beyond their protective role, eyebrows are crucial for nonverbal communication. They help convey a wide range of emotions, such as surprise or anger, through movements like raising, lowering, or furrowing. This ability to express feelings through facial expressions may have aided in building social bonds and preventing conflicts in early human interactions.1