Results: There were two rings system in external nose: ① Alar cartilaginous fibrous ring consisted of the medial crus, lateral crus, septum, accessory cartilage as well as fibrous tissues between anterior nasal spine and accessory cartilage; 结果:外鼻下端存在两个环状解剖结构。①由鼻翼软骨内、外脚及穹窿部,鼻中隔,小翼软骨和连结小翼软骨与前鼻棘的纤维组织组成的鼻翼软骨纤维环;