<prompt> Lamina papyracea is between ?Optic nerve and orbitMaxillary sinus and orbitEthmoid sinus and orbitCranial cavity and orbit  <response>: The thinnest poion of medial wall of orbit is the lamina papyracea which separates ethmoid sinuses from orbit. o Infection from ethmoidal sinus can easily breach this paper thin bone and affect the orbital contents. 