Orbital septum
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2008-05-29T20:00:33Z
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{{Infobox Anatomy |
Name = Orbital septum |
Latin = septum orbitale |
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The '''orbital septum''' ('''palpebral ligament''') is a membranous sheet that acts as the anterior boundary of the [[Orbit (anatomy)|orbit]]. It extends from the orbital rims to the eyelids.
In the upper eyelid it blends with the tendon of the [[Levator palpebræ superioris]], and in the lower eyelid with the [[Tarsus (eyelids) | tarsal plate]].<ref> Meyer DR, Linberg JV, Wobig JL, et al: Anatomy of the orbital septum and associated eyelid connective tissues. Ophthalmic Plast Reconstr Surg 7:104, 1991 </ref>
In some sources, the orbital septum refers to this sheet (here called the palpebral fascia) along with the tarsal plate. <ref> "eye, human."Encyclopædia Britannica. 2008. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 5 Apr. 2008 </ref>
When the eye is closed, the whole orbital opening is covered by the septum. Medially it is thin, and, becoming separated from the [[medial palpebral ligament]], attaches to the lacrimal bone at its [[posterior lacrimal crest | posterior crest]]. The medial ligament and its much weaker lateral counterpart, attached to the septum and orbit, keep the lids stable as the eye moves. <ref> Ibid </ref>
The septum is perforated by the vessels and nerves which pass from the orbital cavity to the [[face]] and [[scalp]].
With age the septum may weaken, and as a result orbital fat may herniate forwards. The operation to correct this is called [[blepharoplasty]].
==References==
<references/>
==External links==
* {{LoyolaMedEd|grossanatomy/dissector/labs/h_n/orbit/main.html}}
* {{cite journal |author=Brémond-Gignac D, Deplus S, Cussenot O, Lassau J |title=Anatomic study of the orbital septum (22.10.93) |journal=Surg Radiol Anat |volume=16 |issue=1 |pages=121–4 |year=1994 |pmid=8047962 |doi=10.1007/BF01627937}}
* [http://www.drmeronk.com/blephnews/anatomy.html Diagram at drmeronk.com]
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