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 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 unnaturally connect to the (*) mouth to form an 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 10 points, name these air-filled spaces (10[1])that open into the nasal (10[1])cavity. ■END■

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