Which bone forms part of the orbital and nasal cavities?

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Ethmoid bone sits between the nose and the eye sockets, so it helps shape both the orbital and nasal cavities. It forms the medial wall of the orbit (lamina papyracea) and contributes to the nasal cavity through the superior and middle nasal conchae, as well as the perpendicular plate that partakes in forming the nasal septum. That dual role is why it’s the bone linked to both spaces. The frontal bone mainly shapes the orbital roof and forehead, the sphenoid is involved more with the posterior part of the orbit and skull base, and the zygomatic bone forms the cheek and part of the lateral orbital wall, not the same dual contribution.