The hand vein features uniqueness and universality . The venous vascular network is not the same between everyone and even the between the hands from the same person but the vascular structure of the individual does not change with time .

手背静脉拥有很好的唯一性和普遍性，在人与人之间，同一个人的两手之间， 静脉的血管 网络是不相同的，但个人的血管结构又不随时间变化。

The venous network of the pia mater usually lies deeper than the arteries and becomes superficial to the latter after joining together to form larger vessels .

软膜 静脉 网多在动脉 网深面，汇成较大的支以后才越至动脉 网的浅面。