The anatomy and physiology of the internal nose are too often left out of consideration by those undertaking rhinoplastic surgery. Knowledge of the basic physiologic mechanisms of normal nasal function should be a prerequisite for operating on the external structures, because of the close relationship between form and function. Despite the fact that our culture places emphasis only on the visible portion of the nose, individual patients trust the rhinoplastic surgeon to respect and preserve the functions of that critical portion that remains unseen.