To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

4,5
Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
Languages
Recent
Show all languages
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.
.
Leo
Newton
Brights
Milds

Orbital septum

From Wikipedia, the free encyclopedia

Orbital septum
The right eye in sagittal section, with structures of the orbital septum within blue markings.
Details
Identifiers
Latinseptum orbitale
TA98A15.2.07.003
TA2471
FMA59328
Anatomical terminology

In anatomy, the orbital septum (palpebral fascia) is a membranous sheet that acts as the anterior (frontal) boundary of the orbit. It extends from the orbital rims to the eyelids. It forms the fibrous portion of the eyelids.[1]

YouTube Encyclopedic

  • 1/3
    Views:
    1 699
    2 286
    10 781
  • ORBITAL SEPTUM ANATOMY | PRE & POST SEPTAL CELLULITIS | 3D STUDY
  • Demonstration of the orbital septum in a pediatric patient
  • Orbital Cellulitis - For Medical Students

Transcription

Structure

In the upper eyelid, the orbital septum blends with the tendon of the levator palpebrae 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

Orbital septum supports the orbital contents located posterior to it, especially orbital fat. The septum can be weakened by trauma or due to hereditary diseases. Anatomical structures important in the blepharoplasty operation (operation to strengthen the orbital septum) are located posterior to the orbital septum.[4]

The orbital septum is an important structure that separates anterior and posterior extent of the orbit. Orbital septum acts as a physical barrier that prevents the infection of the anterior part of the eye spreading posteriorly. For example, preseptal cellulitis mainly infects the eyelids, anterior to the orbital septum. Meanwhile, orbital cellulitis is located posterior the orbital septum, due to infections spreading from the ethmoidal sinuses. The porous lamina papyracea separating the orbit from the ethmoidal sinus causes infection to spread between the orbit and ethmoidal sinuses. Infection of the ethmoidal sinuses can spread to the brain, causing meningitis and cerebral abscess. Orbital cellulitis can also spread to the anterior orbit, by lifting the loosely attached periosteum, causing subperiosteal abscess.[5]

Imaging

Orbital septum appears as hypointense on both MRI T1 and T2 weighted images, in contrast with surrounding hyperintense fat.[6]

References

Public domain This article incorporates text in the public domain from page 1026 of the 20th edition of Gray's Anatomy (1918)

  1. ^ Mafee MF, Valvassori GE, Becker M (10 November 2004). Imaging of the head and neck. Thieme. pp. 200–. ISBN 978-1-58890-009-8. Retrieved 16 June 2010.
  2. ^ Meyer DR, Linberg JV, Wobig JL, McCormick SA (1991). "Anatomy of the orbital septum and associated eyelid connective tissues. Implications for ptosis surgery". Ophthalmic Plastic and Reconstructive Surgery. 7 (2): 104–13. doi:10.1097/00002341-199106000-00004. PMID 1863562. S2CID 31394816.
  3. ^ Davson H (2008). "Eye, human". Encyclopædia Britannica.
  4. ^ Pastorek, Norman; Bustillo, Andres (2007). Blepharoplasty. Elsevier. pp. 59–88. doi:10.1016/b978-1-4160-0146-1.50011-0. ISBN 978-1-4160-0146-1.
  5. ^ Uddin, Jimmy M; Scawn, Richard L (2013). Preseptal and orbital cellulitis. Elsevier. pp. 89–99. doi:10.1016/b978-0-7020-4691-9.00013-3. ISBN 978-0-7020-4691-9.
  6. ^ Ferreira TA, Pinheiro CF, Saraiva P, Jaarsma-Coes MG, Van Duinen SG, Genders SW, et al. (March 2020). "MR and CT Imaging of the Normal Eyelid and its Application in Eyelid Tumors". Cancers. 12 (3): 658. doi:10.3390/cancers12030658. PMC 7139934. PMID 32178233.

Further reading

External links

This page was last edited on 26 February 2024, at 05:16
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.