What is cerebral arterial insufficiency?

We say clinical cerebral blood supply deficiency, that is, insufficient blood supply to the cerebral artery system, excluding venous blood supply deficiency, venous sinus thrombosis, etc. Therefore, we clinically, modern medicine said cerebrovascular disease, including ischemic and hemorrhagic, cerebrovascular disease, refers to the cerebral artery, blood supply system shows obstacles. Including blood supply deficiency, cerebral embolism, cerebral infarction, cerebral thrombosis and so on. Therefore, the cerebrovascular disease we often say here refers to the arterial system, excluding the venous system. If there is a lesion in the venous system, insufficient blood supply, venous sinus, thrombosis, etc., it is another concept, emphasizing the venous system. If the vascular disease of the arterial system, we do not emphasize the word artery. If the venous system, then we must emphasize the vein. Cerebrovascular disease, cerebral blood supply deficiency, all refer to the arterial system.