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1·Levator veli palatini muscle and infeior wall of eustachian tube move from the axis of the tube to outward gradually as increasing with age and overlapping proportion of them was reported.

对不同年龄的腭帆提肌与咽鼓管重叠的比例作了报道，提出了咽鼓管下壁和腭帆提肌随年龄增长而渐离管腔纵轴的观点；