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inferior turbinate middle turbinate frontal recess agger nasi fontanelle posterior ethmoidal artery anterior ethmoidal artery lateral sinus hiatus semilunaris bulla ethmoidalis osteometal complex nose pns development of sinus sphenoid sinus frontal sinus ethmois sinus maxillary sinus sinus paranasal sinus fissures round window oval window tegmen temporal bone middle ear chorda tympani facial nerve tympanic membrane mucosal folds ossicles middle ear anatomy