The vessels were first divided into parietal branch in the muscle layer.The parietal branch was then subdivided into subsidiary anastomotic channels in the mucosal layer.

• 方法根据胃周的主要血管在进入胃壁各层的同时逐级分支的原理,通过识别走行于不同层次的血管所发生的变化判断胃癌的浸润深度。