Superior orbital fissure
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The superior orbital fissure is the communication between the cavernous sinus and the apex of the orbit. It is straddled by the tendinous ring which is the common origin of the four rectus muscles (extraocular muscles).
medial: body of sphenoid
superior: lesser wing of sphenoid
inferior: greater wing of sphenoid
lateral: frontal bone
Through the fissure (from superior to inferior) pass:
superior division of the oculomotor nerve (CN III)
inferior division of the oculomotor nerve (CN III)
a branch of the inferior ophthalmic vein
The order of the nerves may be remembered by these mnemonics.
Superior orbital fissure is best seen on occipitofrontal view with 20 degrees caudal angulation 3.