人体大循环(指心脏、大血管)和小循环(肺循环)对生命的重要性早已为人们所熟悉,但以微动脉、微静脉和毛细血管网为基本单位的微循环尚未得到医学界广泛的重视。微循环是循环系统的终末通道,占人血管分布的99%以上,是维持组织正常代谢的要重场所。微循环中血管,血流和功能的异常是许多疾病的病理基础,故微循环的研究甚为重要。外周微循环(指甲皱、眼球结合膜和眼底血管微循环)是全身微循环的一部分。大量临床实践证明外周微循环的改变虽不能完全代表内脏的微循环,但在一定程度上它可以 The importance of life to the circulatory system (heart, large blood vessels) and circulatory system (pulmonary circulation) has long been known, but microcirculation based on arterioles, venules, and capillary networks has not been widely accepted by the medical community Pay attention. Microcirculation is the terminal channel of the circulatory system, accounting for more than 99% of the distribution of human blood vessels, is to maintain the normal metabolism of the organization of the most important places. Microcirculation vascular, abnormalities in blood flow and function are pathological basis for many diseases, so the study of microcirculation is very important. Peripheral microcirculation (nail wrinkles, ocular conjunctiva and fundus microcirculation) is part of systemic microcirculation. A large number of clinical trials have shown that although the changes in the peripheral microcirculation can not completely represent the internal microcirculation, but to some extent it can