Which paranasal sinus can be examined in the physical exam?
a. ethmoid c. sphenoid
b. frontal d. superior
B
Air-filled cavities lined with mucous membranes are present in some of the cranial bones and are referred to as paranasal sinuses. These air-filled sinuses lighten the weight of the skull and add resonance to the quality of the voice. The frontal, maxillary, ethmoid, and sphenoid paranasal sinuses open into the nose. Only the frontal and maxillary sinuses can be examined in the physical exam.
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