The eyebrows are arched ridges of thick skin and short hairs above each eye, lying over the supraorbital margin. Muscles beneath move them to express emotion.
| Location | Over the supraorbital margin of the frontal bone |
|---|---|
| Parts |
|
| Nerve Supply | Supraorbital and supratrochlear nerves (sensation); Facial nerve (muscles) |
| Blood Supply | Supraorbital and supratrochlear arteries; Superficial temporal artery branches |
Keep sweat and rain out of the eyes, shade them, and communicate facial expression.
Cuts over the eyebrow are common in contact sports because skin is pressed against bone; the brow should not be shaved before repair. Inability to raise the brow helps distinguish facial nerve palsy from stroke. Loss of the outer third of the brows can occur in hypothyroidism.
Splitting of skin over the brow ridge from a blow, common in boxing and other contact sports.
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