Sphenoid Bone

Description

Centered in the cranial base, the sphenoid bone is highlighted against the surrounding calvaria and adjacent skull base, with the greater wings spreading laterally and the lesser wings projecting anteriorly toward the frontal region. Posterior to the body of the sphenoid, the dorsum sellae rises as the posterior boundary of the hypophyseal fossa, while the pterygoid processes descend inferiorly, ending in the medial and lateral pterygoid plates near the posterior hard palate. Along the greater wing, the expected foramina sit in sequence, foramen rotundum anteromedial to foramen ovale, with foramen spinosum posterolateral, all oriented toward the infratemporal fossa. An internal cranial base perspective matters because it ties bony landmarks directly to neurovascular corridors. The relationship of the sella turcica to the optic canal and superior orbital fissure frames how pituitary lesions can present with bitemporal hemianopia, and it matches the route used in transsphenoidal surgery through the sphenoid sinus to the hypophysis. Small distances. Big consequences. Neuroanatomy and head and neck anatomy courses use this plate to teach the middle cranial fossa, the skull base foramina, and the attachment sites for the pterygoid muscles in mastication modules. It also fits well in surgical atlases covering endoscopic endonasal and infratemporal approaches, and in radiology teaching files when correlating CT skull base windows with the sphenoid body, wings, and pterygoid plates. Anatomical accuracy verified by SciePro's Medical Advisory Board.