![]() Whitnall's tubercle is a prominence along the zygomatic bone. Sinus infections can spread to the orbit through the medial orbital wall.The medial orbital wall is the thinnest wall of the orbit the lamina papyracea is the paper-thin aspect of the medial orbital wall.The medial orbital wall consists of four bones: the sphenoid (lesser wing), maxillary, ethmoid, and lacrimal bones.In some extreme cases, the fracture can extend to the medial orbital wall. Typically the orbital rim is not fractured, as the impact force is distributed throughout the entire orbit, inducing a floor fracture (orbital blowout). The orbital floor is the most frequently fractured wall in trauma where an object larger than the orbit (such as a ball or fist) impacts the entire orbit.The orbital floor is the only wall of the orbit that does NOT contain part of the sphenoid bone.The inferior oblique muscle originates from the orbital floor, lateral to the nasolacrimal duct.The lacrimal fossa is formed by the maxillary and lacrimal bones, which contains the nasolacrimal duct.The orbital floor consists of three bones: the palatine, the zygomatic, and the maxillary bones.The lateral orbital wall is the strongest wall of the orbit.The lateral orbital wall consists of two bones: the zygomatic and the sphenoid bone (greater wing).The frontal bone contains the lacrimal gland fossa temporally and the trochlear fossa nasally.The orbital roof consists of two bones: the frontal and sphenoid bone (lesser wing).There are 7 bones that make up the orbit (in no particular order):Ĭheck out our article on the orbital bones for more details. ![]()
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