前筛窦是位于基底板前方的气房,附着于筛顶和纸样板。包括鼻丘、泪泡(lacrimal cells)、漏斗、筛泡及终末气房。前筛窦的侧壁是纸样板,顶壁是筛板与眶顶之间的额骨,此处骨板往往比较薄,其内侧壁的前半部分常常膨大突入窦腔内,以上两个解剖部位是手术中发生脑脊液漏的常见部位。前筛动脉横跨筛顶或在骨板下方行走或在骨板所形成的骨管内行走,术中容易损伤。然而筛前动脉是术中暴露额窦的标志。手术中只要将筛前动脉前方的气房切除即可暴露额窦。当然手术在内窥镜下 The anterior ethmoid sinus is located in front of the base of the air chamber, attached to the top of the sieve and paper model. Including the nostrils, lacrimal cells, funnels, vesicles, and terminal compartments. Front wall of the ethmoid sinus is the paper model, the top wall is between the fringe and the orbital frontal bone, where the plate is often relatively thin, the medial wall of the first half often inflated into the sinus cavity infiltration, more than two anatomical sites Is a common site of cerebrospinal fluid leakage occurred during surgery. The anterior sieve artery across the top of the sieve or walking in the bone plate or the formation of bone in the bone tube within walking, easy to injury during operation. However, the anterior ethmoid artery is the sign of exposure to the frontal sinus. Surgery as long as the anterior ethmoid anterior chamber resection can expose the frontal sinus. Of course, surgery under the endoscope