Onodi cells and haller cells are seen in relation to:
"Onodi cell" is the posterior most posterior ethmoid cell extending lateral to the sphenoid sinus. While removing disease from the Onodi cells there are chances of injury to optic nerve and internal carotid which lie in the vicinity. The posterior ethmoidal cells in the floor of orbit are known as "Haller cells".
Optic nerve and floor of orbit
Optic nerve and frontal sinus
Optic nerve and ethmoid air cells
Optic chiasma and nasolacrimal duct
Anatomy of Nasal Cavity