<P> The bony walls of the orbital canal in humans do not derive from a single bone , but a mosaic of seven embryologically distinct structures : the zygomatic bone laterally , the sphenoid bone , with its lesser wing forming the optic canal and its greater wing forming the lateral posterior portion of the bony orbital process , the maxillary bone inferiorly and medially which , along with the lacrimal and ethmoid bones , forms the medial wall of the orbital canal . The ethmoid air cells are extremely thin , and form a structure known as the lamina papyracea , the most delicate bony structure in the skull , and one of the most commonly fractured bones in orbital trauma . The lacrimal bone also contains the nasolacrimal duct . The superior bony margin of the orbital rim , otherwise known as the orbital process , is formed by the frontal bone . </P>
<P> The bony walls of the orbital canal in humans do not derive from a single bone , but a mosaic of seven embryologically distinct structures : the zygomatic bone laterally , the sphenoid bone , with its lesser wing forming the optic canal and its greater wing forming the lateral posterior portion of the bony orbital process , the maxillary bone inferiorly and medially which , along with the lacrimal and ethmoid bones , forms the medial wall of the orbital canal . The ethmoid air cells are extremely thin , and form a structure known as the lamina papyracea , the most delicate bony structure in the skull , and one of the most commonly fractured bones in orbital trauma . The lacrimal bone also contains the nasolacrimal duct . The superior bony margin of the orbital rim , otherwise known as the orbital process , is formed by the frontal bone . </P>
what is the name of the bone that makes up most of the posterior surface of orbit
what is the name of the bone that makes up most of the posterior surface of orbit
the sphenoid bone
the sphenoid bone