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INTRODUCTION. The paranasal sinuses (âthe sinusesâ) are air-filled cavities located within the bones of the face and around the nasal cavity and eyes. Each sinus is named for the bone in which it is located: Physiology.
52-7 The paranasal sinuses develop as outgrowths from the nasal cavity; hence they all drain directly or indirectly into the nose. Thus, rhinitis may give rise to sinusitis. 52-8 List the chief paranasal sinuses. 52-8 The chief paranasal sinuses are the maxillary, ethmoidal, frontal, and sphenoidal.