Results: The blood flow in the normal vessels were laminar flow, the velocities were different in every stratum, the velocities were the fastest in the center and slow down towards the vessel wall. 结果:正常情况下,动脉血管内血流形式为层流,每层间血流速度不同,中心处血流速度最快,越向管壁处血流速度越慢。