Lesser Wing Of The Sphenoid, Inferior View

Description

Sphenoid lesser wings (alae minores) form a thin, shelf-like ridge projecting anterolaterally from the body of the sphenoid, seen here from an inferior perspective as they extend toward the orbital roof and fade laterally beneath the overhang of the greater wings (alae majores). Medially, each lesser wing arises at the sphenoid body near the planum sphenoidale and terminates as the anterior clinoid process, while the optic canal sits at the wing’s root, just superior to the superior orbital fissure. The free posterior margin of the lesser wing marks the boundary between the anterior cranial fossa (superiorly) and the middle cranial fossa (inferiorly), a spatial relationship that reads well from below when the greater wing partially obscures the lateral extent. A key landmark. Clinically, the lesser wing matters most at the orbital apex and parasellar region, where bony contours constrain the optic nerve (CN II) and ophthalmic artery as they traverse the optic canal, and where the anterior clinoid process can limit surgical corridors. Fractures involving the sphenoid ridge and optic canal are a recognized cause of traumatic optic neuropathy, and anterior clinoidectomy is a common step in approaches to paraclinoid internal carotid artery aneurysms and tuberculum sellae meningiomas. The inferior viewpoint emphasizes the lesser wing’s relationship to the greater wing and the superior orbital fissure region, supporting accurate orientation when correlating dry skull anatomy with CT bone windows. Neuroanatomy and head and neck anatomy courses can pair this illustration with orbital and cavernous sinus modules, while neurosurgical, ENT, and ophthalmology teaching materials can use it to frame discussions of the optic canal, anterior clinoid process, and paraclinoid exposure. Medical publishers often place this image alongside skull base fracture patterns and orbital apex syndromes for quick bony reference. Anatomical accuracy verified by SciePro's Medical Advisory Board.