The roof of the olfactory region is formed by ?
Nasal bone
Cribriform plate of ethmoid
Sphenoid
Temporal bone
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).