Microsurgical Anatomical Study Of The Anterior Communicating Artery Complex

Objective:To investigate the microanatomy of anterior communicating artery complex and important adjoining constitution for providing anatomical data of operating approach.Method:10adult cadaveric heads(20cerebral hemispheres)fixed with formalin were used and anterior communicating artery complex were dissected under surgery microscope.The results were analyzed with SPSS18.0statistical software.Result:The diameter of the left side of A1segment was2.55±0.55mm, the right was2.44±0.46mm.There was no statistically significant difference between two sides of A1segment in diameter(p=0.471>0.05).The number of perforators originated from left side of A1segment was3.80±1.32,the right was4.30±1.42.53.1%of perforators arose from the proximal1/3of the A1segment,7.4%of perforators arose from the middle1/3segment and39.5%of perforators arose from the distal1/3segment.there were no ACoA in10%cases,80%of ACoA were simple type and10%cases were multiple type. The length of ACoA was1.98±0.98mm.71.5%of recurrent arteries of Heubner arose from the junction of AcA and ACoA,while only9.5%of their origin were at the distal A1segment and other19.0%recurrent arteries were arose from the distal A2segment.Conclusion:There were no statistically significant differences between two sides of A1segment in diameter.The shape and the length of ACoA varied much.The middle1/3of A1segment which had less perforating branches was the best position for temporary occlusion during the operation on anterior communicating aneurysms.The origin of RAH most arose from the proximate part of ACoA-AC A junction within3mm, which should be discerned and protected in the operation.