The superior orbital fissure is a foramen in the skull, although strictly it is more of a cleft, lying between the lesser and greater wings of the sphenoid bone.

Superior Orbital Fissure
Superior Orbital Fissure
Superior Orbital Fissure
Rochon-Duvigneaud's syndrome
Microsurgical anatomy of the superior orbital fissure
Orbital neurilemoma with extension through the superior orbital fissure.
The superior orbital fissure: a microanatomical study.
Extradural and intradural microsurgical approaches to lesions of the optic canal and the superior orbital fissure.
Decompression of the optic canal by the transethmoidal route and decompression of the superior orbital fissure.
Embolization of carotid cavernous fistula by means of direct puncture through the superior orbital fissure.
Superior orbital fissure syndrome. Report of a case caused by local pachymeningitis
THE SUPERIOR ORBITAL FISSURE - A MICROANATOMICAL STUDY - COMMENT
The superior orbital fissure and its contents