人体中有许多由肌肉、血管和腱膜等围成的三角形区域。这些三角多数是寻找某些结构的标志。在解剖教学和临床的诊治中具有重要的应用价值。1　头部三角1 1　危险三角　由两侧口角至鼻根连线形成。此三角内的面静脉常常无静脉瓣且通过内眦静脉和面深静脉与海绵窦相通。当上唇 , The human body has many triangular areas surrounded by muscles, blood vessels and aponeurosis. These trigonometry is a sign of finding some structure. In anatomy teaching and clinical diagnosis and treatment has important application value. 1 head triangle 1 1 Dangerous triangle formed by the connection of the two sides of the mouth to the root of the nose. The facial veins in this triangle often have no venous flap and communicate with the cavernous sinus through the internal and medial deep veins. When the upper lip,