脑血管解剖 文本文档（Cerebrovascular anatomy text document）.docVIP

脑血管解剖 文本文档（Cerebrovascular anatomy text document） First, the characteristics of cerebrovascular The arteries of the brain come from the internal carotid artery and the vertebral artery, both of which kiss at the base of the brain to synthesize the Willis ring; The travel of the cranium artery into extreme bending, is the main reason of cerebral artery without beating; The wall of the cerebral arteries is thin and resembles an extracranial vein of equal size; The arteries of the brain is divided into cortical branches (shallow cortex and medulla supply) and the Central Branch (supply and internal capsule basal ganglia and diencephalon), the two are self-contained, and do not coincide; The formation of rich cortical artery anastomosis in pia mater, regarded as brain surface blood pool balance function; The arteries and veins of the brain do not travel together; Cerebral vein and dural sinus without vein valve; The density of capillaries varies in different brain regions, and their density is closely related to the number of synapses and nerve blankets; There is a blood-brain barrier between the cerebral capillaries and the neurons, but the blood-brain barrier is absent in the areas below: the pineal gland, the median eminence of the hypothalamus, the posterior pituitary, the medulla oblongata, the posterior region, the posterior commissure, the endplate, and the choroid plexus; There are many variations of the cerebral vessels, especially the cerebral arteries. Two, the brains arterial system Including the internal carotid artery and the vertebrobasilar artery system. The supratentorial structure accepts the blood supply of the internal carotid artery and the posterior cerebral artery, and the underlying structure receives the blood supply of the vertebral basilar artery system. (I) internal carotid artery system Travel and segmentation of the internal carotid artery 1. extracranial segments (neck): straight and without branches. 2. intracranial segment: carotid angio