- Orbital septum
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Orbital septum 
The right eye in sagittal section, showing the fascia bulbi. Latin septum orbitale Gray's subject #227 1026 The orbital septum (palpebral ligament) is a membranous sheet that acts as the anterior boundary of the orbit. It extends from the orbital rims to the eyelids. It forms the fibrous portion of the eyelids.[1]
Contents
Anatomy
In the upper eyelid it blends with the tendon of the Levator palpebræ superioris, and in the lower eyelid with the tarsal plate.[2]
When the eyes are closed, the whole orbital opening is covered by the septum and tarsi. Medially it is thin, and, becoming separated from the medial palpebral ligament, attaches to the lacrimal bone at its 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.[3]
The septum is perforated by the vessels and nerves which pass from the orbital cavity to the face and scalp.
Clinical significance
With age the septum may weaken, and as a result orbital fat may herniate forwards. The operation to correct this is called blepharoplasty.
The orbital septum is an important landmark in distinguishing between orbital cellulitis and periorbital cellulitis.[4]
References
- ^ Mahmood F. Mafee; Galdino E. Valvassori; Minerva Becker (10 November 2004). Imaging of the head and neck. Thieme. pp. 200–. ISBN 9781588900098. http://books.google.com/books?id=SowUF5Z4saQC&pg=PA200. Retrieved 16 June 2010.
- ^ 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
- ^ "eye, human."Encyclopædia Britannica. 2008. Encyclopædia Britannica 2006 Ultimate Reference Suite DVD 2008"
- ^ "Cellulitis, Orbital: eMedicine Ophthalmology". http://emedicine.medscape.com/article/1217858-overview. Retrieved 2010-06-16.
External links
- MedEd at Loyola grossanatomy/dissector/labs/h_n/orbit/main.html
- Brémond-Gignac D, Deplus S, Cussenot O, Lassau J (1994). "Anatomic study of the orbital septum (22.10.93)". Surg Radiol Anat 16 (1): 121–4. doi:10.1007/BF01627937. PMID 8047962.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained within it may be outdated.
Head and neck anatomy – accessory visual structures (TA 15.2.7, TH H3.11.08.6, GA 10.1021) Eyelid Tarsus (Meibomian pelicle) • Medial palpebral ligament • Epicanthic fold • Meibomian gland • Ciliary glands • Eyelash
Gland of ZeisLacrimal apparatus Lacrimal lake • Lacrimal gland • Lacrimal canaliculi • Lacrimal punctum • Lacrimal papilla • Nasolacrimal duct • Lacrimal sac • Lacrimal caruncle • Krause's glandsOther Periorbita • Orbital septum • Tenon's capsule • Suspensory ligament of eyeball
Conjunctiva (Plica semilunaris)
Extraocular muscles (Trochlea of superior oblique)M: EYE
anat(g/a/p)/phys/devp/prot
noco/cong/tumr, epon
proc, drug(S1A/1E/1F/1L)
Categories:- Eye anatomy
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