<prompt> Osteomeatal complex OMC connects-Nasal cavity with maxillary sinusNasal cavity with sphenoid sinusThe two nasal cavitiesEthmoidal sinus with ethmoidal bulla  <response>: The osteomeatal complex is a narrow anatomical region consisting of:-Multiple bony structures middle turbinate, uncinate process, Bulla ethmoidalis.Air spaces frontal recess, ethmoidal infundibulum, middle meatusOstia of anterior ethmoidal, maxillary and frontal sinuses , therefore, connects these sinuses to nasal cavity. 