6.The front view of skull Specillur (4) the paranasal sinuses鼻旁窦 ① the frontal额 sInuses ② the ethmoidal筛 sinuses ③ the sphenoidal蝶 sinuses ④ the maxillary上颌 sInuses (5) the oral cavity骨性口腔 切除部分鼻甲,示鼻旁窦及鼻汨管 down6.The front view of skull Up down (4) the paranasal sinuses 鼻旁窦 ① the frontal 额 sinuses ② the ethmoidal 筛sinuses ③ the sphenoidal 蝶sinuses ④ the maxillary上颌 sinuses (5) the oral cavity 骨性口腔