已有研究表明，在普遍被观察到的CSD过程中软脑膜动脉血管大幅度舒张之前，还存在一个较小幅度的软脑膜动脉扩张和收缩。
Previous studies showed that before the pial artery large dilation which were widely observed in CSD, there is also a small constriction occurring in pial arteries.
舒张血管：扩张血管，改善皮肤血循环，并增加营养。
Vasodilation effect: it dilates blood vessels, improves blood circulation of the skin, and enhances nutrition.
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