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Laboratory 33. Nasal Cavity
Step 4. The Atrium and Vestibule

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Inspect the area of the lateral nasal wall anterior to the middle turbinate. This region, called the atrium, is continuous with the vestibule inferiorly. The vestibule is lined with skin, not nasal mucosa, and has hairs (vibrissae) on its surface.

Links and References:
Grant's: 7.107, 7.108
Netter: 32, 36, 37, 38
Rohen/Yokochi: 140, 143