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Anatomy
Understanding the nasal anatomy is essential in determining the proper geometry for the model. The nasal airway cavity is a very complex structure extending from the nostrils at the anterior of the head, to the nasopharynx at the posterior of the throat. For a reference the cavity extends all the way to the uvula in the back of your throat, so your nasal cavity extends deep inside the skull. The right and left nostril are separated by the septum, a membrane that is mostly cartilage in the anterior of the nose but becomes a thin bone in the posterior of the cavity. Air flow enters the nose through the nostrils, entering vertically and the flow is redirected horizontally with the curvature of the nose. The nose itself contains flaps of cartilage that act as valves, during a deep inhale the sides of the nose collapse controlling flow.
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http://training.seer.cancer.gov/images/anatomy/respiratory/nose_nasal_cavities.jpg

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