Orbital septum

Dr Craig Hacking and Dr Henry Knipe et al.

The orbital septum 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 to postseptal space (orbit proper) 1.

Radiographic appearance

CT

The orbital septum 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 cornjunctiva forms an anterior soft tissue density 2

MRI 

High-resolution T1WI is a superior imaging technique to depict orbital septum and hence determine boundaries between preseptal and postseptal spaces which have important implication in treatment of periorbital infections or anatomic staging of tumours. 

See also

Head and neck anatomy
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Article information

rID: 26113
System: Head & Neck
Section: Anatomy
Tags: cases, eye
Synonyms or Alternate Spellings:
  • Orbital septum
  • Orbital ligament
  • Orbital fascia

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