#Maxillary #Air #Sinus #Anatomy #Paranasal #Air #Sinuses #Operate #Location #Relations #Blood #Provide [ad_1] The paranasal sinuses are air-filled extensions of the nasal cavity. There are 4 paired sinuses – named in accordance with the bone during which they’re situated – maxillary, frontal, sphenoid and ethmoid. Every sinus is lined by a ciliated pseudostratified epithelium, interspersed