Ethmoid bone

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Constituting part of the base of the skull, the ethmoid bone extends from the medial wall of the orbital canal to the walls of the nasal cavity. This bone, part of the frontal bone, is divided into several entities. The vertical, or perpendicular, plate consists of two distinct segments: the cranial segment and the upper extra cranial segment. The lateral plate has holes through which nerve fibers are routed. Finally, two lateral masses form two other cuboid plates.