<prompt> Thinnest bone is a pa of which boneFrontalEthmoidSphenoidTemporal  <response>: 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. 