This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Lamina papyracea is between ? 
Select and explain. 
A. Optic nerve and orbit, B. Maxillary sinus and orbit, C. Ethmoid sinus and orbit, D. Cranial cavity and orbit
C: Ethmoid sinus and orbit
Answer: C: Ethmoid sinus and orbit 
Explanation: 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.