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).
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.