Anatomical Characteristics Of The Greater Wing Of The Sphenoid

Description

Greater wing of the sphenoid (ala major ossis sphenoidalis) occupies the lateral portion of the sphenoid body, sweeping laterally to form a large share of the middle cranial fossa floor and the anterolateral cranial wall. Its endocranial surface is presented as a broad, concave plate, positioned lateral to the sella region and anterior to the petrous temporal bone, with its posterior margin approaching the sphenoidal spine near the region that meets the squamous temporal. Along the anterior aspect, the greater wing contributes to the posterior orbit via the superior orbital fissure and abuts the frontal bone superiorly, while its lateral edge participates in sutural relationships with the parietal, temporal, and zygomatic bones. Clinically, the greater wing matters because it is defined by skull base foramina that guide neurovascular pathways and surgical corridors: the foramen rotundum (V2) sits anteromedially, the foramen ovale (V3) lies posterolateral to it, and the foramen spinosum transmits the middle meningeal artery just posterolateral to ovale, a relationship that frames the mechanism and typical location of epidural hematoma after pterion trauma. Small positional differences in these apertures also influence approaches for percutaneous trigeminal rhizotomy or biopsy of lesions near the cavernous sinus and Meckel’s cave. Landmarks are unmistakable. Neuroanatomy and head and neck anatomy courses use this illustration to anchor the middle cranial fossa, pterion region, and the route of the trigeminal divisions as they exit the cranial cavity. Medical publishers and radiology educators will find it suited to correlating dry skull anatomy with CT bone windows and to orienting readers for skull base approaches that traverse the infratemporal fossa and lateral orbital wall. Anatomical accuracy verified by SciePro's Medical Advisory Board.