What is the anatomy of orbital septum relevant to periorbital infections?

Updated: Jul 31, 2018
  • Author: Bobak Zonnoor , MD; Chief Editor: Gil Z Shlamovitz, MD, FACEP  more...
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Answer

The orbital septum is a fibrous membrane that extends from the periosteum of the orbit as the arcus marginalis and lies just deep to the orbicularis oculi muscle.

In the upper lids, the septum fuses with the levator aponeurosis. In the lower lids, the septum fuses with the capsulopalpebral fascia. [7] The orbital septum acts as a physical barrier to the spread of infection.

Note the anatomical drawings below.

Upper eyelid anatomy. Upper eyelid anatomy.
Lower eyelid anatomy. Lower eyelid anatomy.

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