![]() Medical Dictionary, © 2009 Farlex and Partners The orbital floor extends from the rim to approximately two thirds of the depth of the orbit, where it curves medially as the posterior medial border of the inferior orbital fissure and blends with the medial wall. The anterior edge of the bony orbit, or eye socket, formed by the maxilla and zygomatic bone inferiorly and the frontal bone superiorly. Located on the lateral orbital wall just inferior to the frontozygomatic suture and approximately 1 cm posterior to the lateral orbital rim is a protuberance that Whitnall indicated was present in 96% of the specimens he dissected orbital rim. ![]() ![]() It is also known as the orbital rim No discussion of orbital anatomy would be complete without the mention of this anatomic landmark. Base - Opens out into the face, and is bounded by the eyelids. Apex - Located at the opening to the optic canal, the optic foramen. Lateral wall - Formed by the zygomatic bone and greater wing of the sphenoid. The orbital rim creates the anterior lacrimal crest and then spirals posteriorly to end at the posterior lacrimal crest The ethmoid bone separates the orbit from the ethmoid sinus. The lateral and superior rims are the strongest. The orbital rim is composed of the frontal, zygomatic, and maxillary bones that adjoin at suture lines (frontozygomatic, zygomaticomaxillary, and frontomaxillary, respectively).
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