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©2013 UpToDate ® Print Email Anatomy of the orbit Orbital structure Bones Associated structures Superior orbital rim, roof of orbit Frontal bone Frontal sinus, supraorbital nerve Lateral wall of orbit Sphenoid bone, zygoma Lateral canthal ligament Infraorbital rim and floor of orbit Zygoma, maxillary bone Inferior oblique and inferior rectus muscles, maxillary sinus, infraorbital nerve Medial wall of orbit Maxillary and ethmoid bones Medial rectus muscle, ethmoid sinus, medial canthal ligament, lacrimal duct system