![]() ![]() ![]() Extension of bacterial rhinosinusitis is the most common cause of orbital cellulitis. ![]() 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. The anatomy of the orbital septum and associated eyelid connective tissues was examined using cadaver dissection, histologic sections, surgical observations. Orbital cellulitis is an infection of the subcutaneous tissue and ocular muscles located inside the orbit. 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. The orbital septum was incised at its center for about a length of 10 mm, just above the tarsal plate, and the pretarsal orbicularis muscle was dissected until the tarsal plate was exposed across the same width ( Fig. 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. 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 is a fibrous layer that originates and runs from superior and inferior orbital margins (i.e., orbital periosteum) and encircles the globe. ![]()
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