本文介绍国人46例(92侧)人脑标本有关后交通动脉(PcoA)及其内穿支显微解剖资料。结果约60％以上两侧PcoA管径不等,近半数PcoA与大脑后动脉解剖出现变异。临床上PcoA是Willis动脉环重要血管之一;PcoA内穿支分为前后两组,穿入脑深部后组成重要的“丘脑穿动脉”;内穿支之间有吻合支存在。 This article describes the 46 Chinese (92 sides) human brain specimens related to the posterior communicating artery (PcoA) and its inner wear microdissection data. Results About 60% of the PcoA diameters ranged from one side to the other, with nearly half of the PcoA and posterior cerebral artery anatomic variations. Clinically, PcoA is one of the important vessels of the Willis arterial ring. The perforating branches of PcoA are divided into two groups before and after penetrating deep into the brain, forming an important “thalamic perforating artery”. There is anastomosis between the perforating branches.