椎-基底动脉系统又称后循环,由椎动脉、基底动脉、大脑后动脉及其各级分支组成,主要分支供应脑干、小脑、枕叶、颞叶后部、丘脑和上段脊髓等。缺血性脑血管病中有20%是由后循环缺血引起的。过去由于诊断方法和临床资料的缺乏,普遍认为后循环缺血性卒中引起的瘫痪大多数是破坏性 The vertebrobasilar artery system, also known as the posterior circulation, consists of the vertebral artery, the basilar artery, the posterior cerebral artery and its branches at all levels. The main branch is the brainstem, cerebellum, occipital lobe, temporal lobe, thalamus and superior spinal cord. Twenty percent of ischemic cerebrovascular diseases are caused by posterior circulation ischemia. In the past due to the lack of diagnostic methods and clinical data, it is generally believed that the majority of paralysis caused by posterior ischemic stroke is destructive