Orbital Surface Of The Frontal Bone, Anterior View

Description

Frontal bone orbital plates form the superior walls (roofs) of the right and left orbits, meeting near the midline above the ethmoidal region and sloping inferolaterally toward the zygomatic processes. Along the anterior margin, the supraorbital rims define the superior orbital aperture, with the supraorbital notch or foramen positioned near the junction of the medial and middle thirds for passage of the supraorbital nerve and vessels. On the orbital surface itself, the lacrimal fossa lies anterolaterally for the lacrimal gland, while the trochlear fovea (or trochlear spine region) sits anteromedially, just superior to the medial canthus, anchoring the pulley of the superior oblique muscle. Orientation is unambiguous. Orbital roof anatomy matters in blunt trauma and craniofacial surgery because a thin orbital plate can fracture into the orbit, producing superior orbital rim step-off, proptosis, diplopia, or entrapment of periorbital tissues, and it also forms the floor of the anterior cranial fossa where frontal lobe injury or cerebrospinal fluid leak may coexist. The close relationship of the lacrimal fossa to the superolateral orbit makes it a practical landmark during lateral orbitotomy and when planning approaches around the frontozygomatic suture. Even in a fixed anterior perspective, the smooth concavity of the roof and the contour of the supraorbital margin help you teach how orbital volume is bounded superiorly and where neurovascular structures exit onto the forehead. Use this illustration in gross anatomy and head and neck modules, radiology teaching files that correlate orbital roof fractures on CT, and operative anatomy references for cranio-orbital approaches and lacrimal gland exposure through the superior orbit. Anatomical accuracy verified by SciePro's Medical Advisory Board.