<prompt> Structures passing through superior orbital fissure-a Oculomotor nerveb Trochlear nervec Lacrimal nerved Nasocilliary nervee Abducent nerveabcdacdeabcdeabce  <response>: Structures passing through superior orbital fissure are :-Middle part within the ring :- Upper and lower division of oculomotor nerve, nasociliary nerve, abducent nerve.Lateral part above the ring :- Trochlear nerve, frontal nerve and lacrimal nerve, superior ophthalmic vein, . recurrent menigeal branch of lacrimal artery, orbital branch of middle meningeal artery and sometimes meningeal branch of ophthalmic artery.Medial part below the ring :- Inferior ophthalmic vein, sympathetic nerves around ICA. 