Orbital septum
Citation, DOI, disclosures and article data
At the time the article was created Henry Knipe had no recorded disclosures.
View Henry Knipe's current disclosuresAt the time the article was last revised Kajanan Nithiyananthan had no financial relationships to ineligible companies to disclose.
View Kajanan Nithiyananthan's current disclosures- Orbital ligament
- Orbital fascia
- Orbital septa
The orbital septum (plural: orbital septa) is a thin sheet of fibrous tissue that originates from the orbital rim periosteum and blends with the tendon of the levator palpebrae superioris superiorly and inserts into the tarsal plate inferiorly.
The orbital septum separates the intra-orbital fat from eyelid fat and orbicularis oculi muscle, and also provides a barrier against spread of infection between the preseptal space and postseptal space (orbit proper) 1.
Radiographic appearance
CT
The orbital septum is difficult to identify but appears in the region that contains the separation of the orbital fat from the subcutaneous (eyelid) fat and the orbicularis oculi muscle and together with the eye lids and conjunctiva forms an anterior soft tissue density 2.
MRI
High-resolution T1WI is a superior imaging technique to depict the orbital septum and hence determine boundaries between the preseptal and postseptal spaces which have important implications in treatment of periorbital infections or anatomic staging of tumors.
See also
References
- 1. Capps EF, Kinsella JJ, Gupta M et-al. Emergency imaging assessment of acute, nontraumatic conditions of the head and neck. Radiographics. 2010;30 (5): 1335-52. doi:10.1148/rg.305105040 - Pubmed citation
- 2. Fatterpekar G. The Teaching Files: Head and Neck Imaging: Expert Consult - Online and Print. Saunders. ISBN:1416060596. Read it at Google Books - Find it at Amazon
- 3. Hoffmann KT, Hosten N, Lemke AJ et-al. Septum orbitale: high-resolution MR in orbital anatomy. AJNR Am J Neuroradiol. 1998;19 (1): 91-4. Pubmed citation
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