The roof of the olfactory region is formed by ?
Ans. is 'b' i.e., Cribriform plate of ethmoid The olfactory mucosa lines the upper one-third of nasal cavity including the roof formed by cribriform plate and the medial and lateral walls up to the level of superior concha (turbinate).
Nasal bone
Cribriform plate of ethmoid
Sphenoid
Temporal bone