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Orbital septum

Recommended video: Bones of the orbit [18:29]
Bones and bony structures of the orbit.

The orbital septum is a fibrous membrane which spans from the margins of the orbit, where it is continuous with the periosteum, to tarsal plates in the eyelids. It is thicker laterally, anterior to the lateral palpebral ligament. The orbital septum is pierced by the lacrimal, supraorbital, supratrochlear and infratrochlear nerves passing from the orbit to the face/scalp.

The orbital septum supports the eyelids and structures located posterior to it, including keeping the orbital fat contained. It also acts as a physical barrier and limits infections spreading to and from the orbit. 

Terminology English: Orbital septum
Latin: Septum orbitale
Definition Fibrous membrane spanning from the orbital margin to the tarsal plates in the eyelids.
Function Supports eyelids, keeps orbital fat contained, limits spread of infection to and from orbit

Learn more about the anatomy of the eyelids with this study unit (and article):

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