Structues passing in superior and inferior orbital fissures

Structures passing through Superior Orbital fissure

It is divided into 3 parts from lateral to medial

Lateral Part transmits: lacrimal nerve, frontal nerve, trochlear nerve, meningeal branch of lacrimal artery, anastomotic branch of middle meningeal artery which anastomoses with recurrent branch of the lacrimal artery

Middle Part transmits: Upper and lower divisions of the oculomotor nerve, nasociliary nerve between the two divisions of oculomotor nerve and abducent nerve

Medial Part transmits: Superior ophthalmic vein and sympathetic nerves from the plexus around internal carotid artery

Mnemonic for nerves in superior orbital fissure

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Lacrimal, Frontal, Trochlear, Superior Division of Oculomotor, Abducens, Nasociliary and Inferior Division of Oculomotor nerve.

Structures passing through Inferior Orbital fissure

It transmits the maxillary nerve and its zygomatic branch, and the ascending branches from the pterygopalatine ganglion.

The infraorbital vessels are not found in the inferior orbital fissure, but rather in the infraorbital foramen.