Usually triangle in shape, has three margins ■前缘( ostal margin,外缘 Outer margin,后缘i Inner margin 肩角 Humeral angle,顶角 Apical angle,,臀角 Anal angle 基褶 Basal fold,臀褶 annal fold,轭褶 jugal fold 腋区 axillary region,臀前区 remigium,臀区 vanna region vannus 轭区 jugal region 肩角基溶 前绿 区 顶角 餐前区 轭区 餐区 霄角 餐福