<prompt> Osteomeatal complex connects:Nasal cavity with maxillary sinusNasal cavity with sphenoid sinusThe two nasal cavitiesNasal cavity with lacrimal sac  <response>: a Nasal cavity with maxillary sinusRef. Cummings, 6th ed., 752All the structures of the middle meatus together constitutes osteomeatal complex. The osteomeatal complex connects the nasal cavity with maxillary, frontal and anterior ethmoid sinuses.Spheno-ethmoidal recess connects Sphenoid sinus with nasal cavity.Nasolacrimal duct connects nasal cavity with lacrimal sac.The two nasal cavities remain separated by the nasal septum 