Transnasal endoscopic examination of the nasopharyngeal opening of the ET during rest, swallowing, and yawning was carried out to study its dilatory moements.

• 通过鼻内镜检查咽鼓管鼻咽部开口在休息、吞咽和打呵欠时的情况，从而实现对它缓慢运动的研究。