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 · Airfilled cavities located within specific facial and skull bones are known as paranasal sinuses Humans have four paired paranasal sinuses, frontal, maxillary, sphenoid, and ethmoid, all extending from the respiratory area of the nasal cavity, and named after the bones they are found inAnatomy Furuncle of the nose Cause •Skin infection of the nasal vestibule / tip of the nose Usually due to hair follicle Symptoms •Swelling, Pain, Redness Danger •Septic emboli via the angular vein / cavernous sinus drainageParanasal Sinuses Paranasal sinuses refer to a group of airfilled spaces around the nasal cavity (a system of air channels that connect the nose with the back of the throat) (1)They facilitate the circulation of the air breathed in and out of the respiratory system (2) Paranasal sinuses have four different pairs maxillary sinuses, frontal sinuses, sphenoidal sinuses, and ethmoidal What Are The Sinuses Pictures Of Nasal Cavities Nasal cavity anatomy