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
Cribriform plate forms ? 
Select and explain. 
A. Roof of olfactory region, B. Floor of olfactory region, C. Nasal septum, D. All of the above
A: Roof of olfactory region
Answer: A: Roof of olfactory region 
Explanation: Internal noseInternal nose has following pasi) Nasal cavity proper :- Internal nose is divided into right and left nasal cavities by nasal septum. Each nasal cavity communicates with the exterior through naris or nostrils and with nasopharynx through posterior nasal apeure or posterior ?tares or choana.ii) Vestibule of nose :- Anterior and inferior pa of the nasal cavity is lined by skin and is called vestibule of nose. It contains sebaceous glands, hair follicles and the hair called vibrissae.Each nasal cavity has a lateral wall, a medial wall (nasal septum), a roof, and a floor.The olfactory mucosa lines upper 1/3 of nasal cavity including the roof formed by cribriform plate, and medial and lateral wall up to the level of superior concha.