|
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. ==Structures passing through== A number of important anatomical structures pass through the fissure, and these can be damaged in orbital trauma, particularly blowout fractures through the floor of the orbit into the maxillary sinus. These structures are: * superior and inferior divisions of oculomotor nerve (III) * trochlear nerve (IV) * lacrimal, frontal and nasociliary branches of ophthalmic (V1). * abducens nerve (VI) * superior and inferior divisions of ophthalmic vein. Inferior division also passes through the inferior orbital fissure. * sympathetic fibers from cavernous plexus These include nonvisual sensory messages, such as pain, or motor nerves. They also serve as vascular connections.〔"eye, human."Encyclopædia Britannica from Encyclopædia Britannica 2006 Ultimate Reference Suite DVD〕 The nerves passing through the fissure can be remembered with the mnemonic, "Live Frankly To See Absolutely No Insult" - for Lacrimal, Frontal, Trochlear, Superior Division of Oculomotor, Abducens, Nasociliary and Inferior Division of Oculomotor nerve.〔(【引用サイトリンク】 Superior orbital fissure: Structures passing through )〕 It is divided into 3 parts from lateral to medial: *Lateral part transmits: superior ophthalmic vein, lacrimal nerve, frontal nerve, trochlear nerve (CN IV), recurrent meningeal branch of lacrimal artery (anastomotic branch of lacrimal artery with the middle meningeal artery) *Middle part transmits: Superior and inferior divisions of the oculomotor nerve (CN III), nasociliary nerve (lies between the two divisions of oculomotor nerve) and abducent nerve *Medial part transmits: Inferior ophthalmic veins and sympathetic nerves arising from the plexus that accompanies the internal carotid artery 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「superior orbital fissure」の詳細全文を読む スポンサード リンク
|