Lemaire R
Phlebologie. 1988 Apr-Jun;41(2):441-7.
Generally speaking, the cerebral circulation is not well known. This lack of knowledge causes problems for the physicians nad here are two examples: 1) resistance of the cerebral circulation. It is an accepted fact that the blood flow in the brain is particularly rapid. Classical anatomical data and recent mechanical notions invalidate this statement. With an average speed in the veins, the blood cannot, in a given time, complete such a long and complex course. What hypothesis could be expressed to find a solution? 2) The physiological role of the spinal fluid. It is an accepted fact that the spinal fluid is only a protecting device of the nerve centers. Recent studies let to believe that it could also have a role in the regulation of the venous flow. There are other mechanical problems: what are the characteristics of the flow in the venous sinus? in the venous junctions? in the venous dilations? Although lesions of the venous cerebral circulation present clinical manifestations to which the vein specialists are not accustomed to, they cannot deny the fact that this is a familiar pathology.
一般来说，脑循环并不为人所熟知。这种知识的匮乏给医生们带来了问题，这里有两个例子：1）脑循环的阻力。脑内血流特别快，这是一个公认的事实。经典解剖学数据和近期的力学概念使这一说法站不住脚。静脉内血流平均速度下，血液在给定时间内无法完成如此漫长而复杂的行程。可以提出什么假设来找到解决方案呢？2）脑脊液的生理作用。脑脊液只是神经中枢的一种保护装置，这是一个公认的事实。近期研究让人相信它在静脉血流调节中也可能发挥作用。还有其他力学问题：静脉窦内的血流特征是什么？静脉交汇处呢？静脉扩张处呢？尽管脑静脉循环病变呈现出静脉专家们并不熟悉的临床表现，但他们不能否认这是一种常见病理状况这一事实。
