脑的血液供应有两个来源:颈内动脉和椎动脉。前者供应大脑半球的前2/3,后者供应大脑半球的后1/3、脑干和小脑。两者供血范围大致以顶枕裂为界,互不相混,以保持正常平衡,並在脑底联接成脑底动脉环。脑静脉血流入静脉窦,主要通过颈内静脉流回腔静脉。一、脑的血流力学特征颅腔为脑组织、脑血管、脑脊液所充盈,三者容积之和相当固定,若一者容积增 There are two sources of blood supply to the brain: the internal carotid artery and the vertebral artery. The former supplies the first two thirds of the hemisphere, which supplies 1/3 of the hemisphere, the brainstem and the cerebellum. Both the blood supply range roughly to the top of the occipital ring as the boundary, mutually exclusive, in order to maintain normal balance, and in the brain connected to the cerebral artery ring. Venous blood into the venous sinus, mainly through the internal jugular vein back to the vena cava. First, the hemodynamics of the brain Cranial cavity for brain tissue, cerebrovascular, cerebrospinal fluid filling, the volume of the three is quite fixed, if one volume increased