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Fig. 3. Regional identification of the bony nasal passages and sinus complex (according to Fraser and Purves, 1960) in (A) CIN and (B) WEN. The objects in the figure represent the actual air space not the tissue boundaries of the air space. Compartmentalization of the cranial air space results from the constriction of the nasal plug and the palatopharyngeus muscle. NP, nasal passages; PtS, primary pterygoid sinus; PtS OL, optic lobe of the pterygoid sinus; PtS ML, mesial lobe of the pterygoid sinus; MEC, middle ear complex; PmS, pre-maxillary sac; PaS, constriction of the palatopharyngeal sphincter.





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