blood brain barrier；
脑的毛细血管壁和神经元有血脑屏障
10. The mutation of cerebral arteries
is very common，
脑动脉的变异是很常见的
especially in Willis’ circle 。
the artery systeme of brain
A1 horizontal segment（水平段）； A2 ascending segment （升段）； A3 knee -segment （膝段）； A4 pericallosal segment（胼段） ； A5 end- segment （终末端）。
（2）branches and distribution（分支及分布 ）
7. the cerebral arteries do not accompanied by veins ；
脑的动脉不与脑静脉伴行
8. the cerebral veins and cranial sinuses are no
venous valve； 脑的静脉和颅窦是没有静脉瓣
9. the both of cerebral blood capillary and neuron have
the structures of infratentorium accept blood from vertebralbasilar A.S.
internal carotid A. S.
To according to the journey, internal carotid A.can be divided in to 1. cervical segment
cortical branches： medial frontobasal a. posteromedial frontal a. pericallosal a. paracentral a. precuneal a.
before part of parietooccipital sulcus, hemispheric medial face。
anterior view ，like“T”, formed by M1+A1+C1 posterior view ， like“C”， formed by C2+C3+C4
the main branches of internal carotid artery
颈内动脉的主要分支： 1. ophthalmic A.（眼动脉）
capsule,diencephalon）；
cortex branches central branches
6. the both systems haven,t
anastomosis each other；
这两个系统都没有相互吻合
for example : blood vessels block
The applied anatomy of cerebral vessels
脑血管的应用解剖
The characteristic of cerebral vessels
脑血管的特性
the composition : internal carotid a.s. vertebral a.s.
2. the both systems form anastomosis
2. posterior communicating A.（后交通动脉）
3. ant. choroidal A.:
cortex branches：
central branches： pallidus。
hippocampus and uncus；
posterior limb of internal capsule and globus
it,s characteristic is slender，to take place embolism easily。
其特点是纤细的，轻易发生栓塞
4. anterior cerebral a.（大脑前动脉）
(1) To according to the journey, anterior cerebral a. can be divided in to:
internal carotid A. S. vertebral-basilar A.S.
To according to tentorium of cerebellum:
the structures of supratentorium accept blood from internal carotid A. S. and posterior cerebral artery;
breake and bleedig is very easy ；
5. the cerebral arteries can be divided in to:
cortex branches
cerebral cortex
central branches
（basal nucleus,internal
2. encranial segment ：
C5, carotid canal segment ； C4, cavernous segment ； C3, knee segment ； C2, chiasmatic cistern segment ；
C1, end segment
Brain angiography（脑血管造影）:
( Willis circle )；
3. The two artery systems
enter cranial cavity by flexed
journey；
arteriae systematicac
cerebral arteries
4. the wall of cerebral arteries is very thin , so
central branches（medial lenticulostriate artery）
include：
A. recurrent branches（Heubner artery）: putamen、head of caudate nucleus 、