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FIGURE 1 Coronal section of the head to illustrate relationship of, sinuses, osteomeatal complex, and teeth. Legend: (be) bulla of ethmoid, (cp) cribiform plate, (es) ethmoid sinus, (fs) frontal sinus,(hs) hiatus semilunaris, (lp) lamina papyracea of ethmoid, (omc) osteomeatal complex, (ms) maxillary sinus, (up) uncinate process, black arrows demonstrate flow of secretions to ostia.