Superficiliary Arch Of The Frontal Bone

Description

Superciliary arch of the frontal bone forms the prominent brow ridge immediately superior to the supraorbital margin and roof of the orbit. In an anterior cranial perspective, the curved thickening spans laterally from the glabella toward the frontal eminences, creating a paired elevation separated at the midline by the smoother frontal squama. The supraorbital notch or foramen lies at the inferior aspect of this region along the superior orbital rim, transmitting the supraorbital nerve and vessels as they pass anteriorly onto the forehead. Bony contours are the focus. Clinically, the superciliary arch and adjacent superior orbital rim matter in blunt facial trauma, where fractures of the frontal bone can extend into the orbital roof or involve the frontal sinus, altering contour and risking diplopia from associated orbital injury. The relationship of the arch to the supraorbital notch/foramen also guides local anesthetic blocks and surgical incisions for brow, upper blepharoplasty, and frontal craniotomy approaches, where protection of the supraorbital neurovascular bundle reduces postoperative forehead numbness. Crisp surface relief and a fixed anterior orientation support teaching of palpable landmarks such as glabella, nasion, and the brow ridge used in examination and in anthropometric documentation. Use this illustration in gross anatomy and osteology coursework to correlate frontal bone morphology with facial landmarks and the boundaries of the orbit. It also suits operative atlases and facial trauma references discussing superior orbital rim fixation points, frontal sinus involvement, and supraorbital nerve block technique. Anatomical accuracy verified by SciePro's Medical Advisory Board.