Sinuses. Oral Anatomy, DA102. Purpose of the Sinuses:. Purpose: Hollow cavities of the nasal sinuses function to lighten the overall bone weight of the skull Increase ability to breathe Provide voice tone. Four Pairs of Sinuses (bilateral).
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Oral Anatomy, DA102
Please note the location of the sinuses on this x ray. If a patient loses a tooth in the sinus region, the sinus cavity will extend down into the location were the tooth was.