Lamina papyracea

The lateral surface of the labyrinth of the ethmoid bone is formed of a thin, smooth, oblong plate, the lamina papyracea (or orbital lamina), which covers in the middle and posterior ethmoidal cells and forms a large part of the medial wall of the orbit.

It articulates above with the orbital plate of the frontal bone, below with the maxilla and the orbital process of palatine bone, in front with the lacrimal, and behind with the sphenoid.