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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.
frontal sinus, one of a pair of small cavities in the frontal bone of the skull that communicate with the nasal cavity and lie above the orbits. The frontal sinuses are situated behind the superciliary arches and are lined with a mucous membrane that is continuous with that of the nasal cavity.rontal sinus one of the paired paranasal sinuses in the frontal bone, each communicating with the middle nasal meatus on the same side. intercavernous s's channels connecting the two cavernous sinuses, one passing anterior and the other posterior to the stalk of the pituitary gland.