The supraorbital nerve is a branch of the frontal nerve, which itself is a division of the trigeminal nerve. It primarily provides sensory innervation to the forehead, scalp, and upper eyelid. This nerve emerges from the orbit through the supraorbital notch or foramen, allowing it to reach the skin and tissues in its designated areas. In addition to sensory functions, the supraorbital nerve also carries autonomic fibers that contribute to the regulation of blood flow and sweat production in the forehead region. Understanding this nerve is important in fields like neurology and ophthalmology, especially during surgical procedures involving the forehead and eye area.