颈部是由支持、传导、联系及运动等结构所组成的圆柱体,又是全身淋巴的总汇区。收集胸腹部淋巴的胸导管就位于左锁骨上区,故淋巴系统炎症、肿瘤常发生在颈部,从组织结构来看,颈部具有三种胚层组织,而且是消化、呼吸道入口,经常接受各种外界 The neck is a cylinder composed of structures of support, conduction, connection, and movement, and is also the confluence of whole body lymph. The thoracic duct that collects the chest and abdomen lymph is located in the supraclavicular region of the left, so the inflammation of the lymphatic system and the tumor often occur in the neck. From the point of view of histological structure, the neck has three kinds of germ layers, and it is the entrance of digestion and respiratory tract. Outside world