Applied anatomy and physiology of the nose and paranasal sinuses.

Breathing through and in the early the nose is vital for most animal species life of humans. The nose has a more complex role than just a simple tube-like airway: the anatomy of the nose is quite particular and its different functions are highly specific. Its close anatomical and functional relationships with the inferior airways urge the nose to develop a complete system of defense and air conditioning. It is possible not to breathe through the nose but the consequences of this are multiple, especially with regard to the protection of the lower respiratory tract.