Round 6: Tossup 1

Lesions arising from these structures called A·C·Ps can be excised during a Caldwell-Luc procedure. One of these structures, whose floor can be reached by Haller cells, can be “lifted” in a procedure that may cause perforation of the Schneiderian membrane. The semilunar hiatus connects a group of these structures to the middle meatus (“mee-AY-tuss”). Titanium (-5[1])plates replace the anterior wall of one of these structures in a type three contour reduction performed in some F·F·S operations. One of these structures can (-5[1])unnaturally connect to the (*) mouth to form an (-5[1])oro·antral communication following an improper molar extraction. These structures, named according to the bones they are found in, have sphenoidal, ethmoid, maxillary, and frontal types. For (-5[1])10 points, name these air-filled (10[1])spaces (10[1])that open into the nasal cavity. (10[3]0[1])■END■

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