Greater wing of sphenoid

Last revised by Craig Hacking on 2 Aug 2021

The greater wing or ali-sphenoid of the sphenoid bone is a process which projects from either side of the lower part of the sphenoid body, at a common junction with the pterygoid process 1. It is a paired structure, which curves upward, backward and laterally from each side of the sphenoid body, which can be likened to the extended wings of a bat 2. Both wings also have a triangular process projecting inferiorly which is known as the spine of the sphenoid bone.

The greater wing of the sphenoid features superior, lateral and orbital surfaces.

The superior surface features:

The lateral surface features:

The orbital surface features:

The lateral margin of the posterior border of greater wing articulates with the anterior border of petrous temporal bone.

The posterior most part of the greater wing projects as a triangular process, sitting within the angle of the junction between the squamous and petrous portions of the temporal bone

The tip of the great wing articulates with the parietal bone at the pterion.

  • sphenoidal emissary foramen (occasionally present) it is a small aperture medial to the foramen ovale, opposite the root of the pterygoid process; it opens below near the scaphoid fossa and transmits a small vein from the cavernous sinus
  • foramen petrosum (occasionally present), a small opening between the foramen spinosum and foramen ovale, for transmission of the lesser petrosal nerve
  • common variant of foramen spinosum where the meningeal artery passes through foramen ovale instead of foramen spinosum

The greater wings of the sphenoid are the only bony structures of the skull which undergo both intramembranous and endochondral ossification.

  • injuries most commonly associated with fractures of the sphenoid are orbital fractures and mid-face fractures which usually occur following high energy trauma 3
  • fractures of the greater wing of the sphenoid are relatively uncommon and mostly associated with lateral orbital wall fractures along the broad spheno-zygomatic suture 4
  • lateral orbital decompression surgery for exophthalmos 5
  • lateral orbital wall fracture repair 4
  • emergent surgical relief of optic nerve compression 6

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Figure 1: sphenoid bone, anterior view
    Drag here to reorder.
  • Figure 2: sphenoid bone, posterior view
    Drag here to reorder.
  • Figure 3: superior view (Gray's illustrations)
    Drag here to reorder.
  • Figure 4: anteroinferior view (Gray's illustrations)
    Drag here to reorder.
  • Figure 5: posteroinferior view (Gray's illustrations)
    Drag here to reorder.