Fissura orbitalis superior
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:
The order of the nerves may be remembered by these mnemonics.
- extraocular muscles
- inferior orbital fissure
- tendinous ring
- Sinus cavernosus
- trochlear nerve (CN IV)
- Nervus oculomotorius
- Nervus abducens
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