Thinnest bone is a pa of which bone

The lamina papyracea (or orbital lamina) is a smooth, oblong bone plate which forms the lateral surface of the labyrinth of the ethmoid bone in the skull. The plate covers in the middle and posterior ethmoidal cells and forms a large pa of the medial wall of the orbit. The ethmoid bone is an anterior cranial bone located between the eyes.] It contributes to the medial wall of the orbit, the nasal cavity, and the nasal septum. The ethmoid has three pas: cribriform plate, ethmoidal labyrinth, and perpendicular plate.