目的：通过对大脑前动脉远段的显微解剖，尤其是A3段下半胼周与胼缘动脉间关系，旨在提出处理大脑前动脉远段动脉瘤的外科策略。方法：在10具血管经彩色乳胶灌注的尸头上检查大脑前动脉远段区域的显微解剖，了解胼周动脉胼下段与胼缘动脉及胼周动脉A2段与额极动脉的关系，同时测量鼻根部与胼缘动脉起点处近端胼周动脉长轴延长线与额部交点（PC点）间的距离，并模拟外科入路至大脑前动脉远段动脉瘤。结果：胼周胼缘动脉结合部位于A3段的胼上段和胼下段分别占55％和45％，对于胼下型者，获得载瘤动脉的近端控制较为困难。在尸头标本和T2RMRI正中矢状位上，从鼻根部到PC点的平均距离分别是31.52 mm和34.64 mm。通过前纵裂入路接近PC点下方大脑前动脉远段的胼下动脉瘤并建立有效的控制仅有一有限的操作空间。结论：当在PC点上方入路时，在解剖和夹闭动脉瘤前要想建立有效的近端控制，切开胼胝体前端是必要的。PC点是计划胼下型大脑前动脉远段动脉瘤外科策略的重要外科标志。

　　Objective: To present a surgical strategy dealing with the distal anterior cerebral artery aneurysm(DACAA) by the microanatomy of distal anterior cerebral artery, focusing especially on the relationship between the pericallosal artery (PerA) and callosomarginal artery (CMA) located in the lower half of the A3 (infracallosal) segment. Methods: The microsurgical anatomy of the distal anterior cerebral artery region was examined on 20 adult cadaveric cerebral hemispheres after perfusing of the arteries and veins with colored silicone. The relationships of the infracallosal segment of the PerA to the CMA and the A2 segment of the PerA to the frontopolar artery were examined. The distance between the nasion and the site at which a parallel line directed along the long axis of the infracallosal PerA just proximal to the origin of the CMA artery crosses the forehead (which we have named the PC point) was also measured. In addition, the surgical approaches to DACAA were examined in stepwise dissections. Results: The pericallosal-callosomarginal artery junctions located at the supracallosal and infracallosal segments of A3 in accounting for 55 and 45% of cases, respectively. In the infracallosal region, it was difficult to gain proximal control of the artery with the tumor on it. The PC point was, on average, 31.52 mm and 34.64 mm away from the nasion in cadaveric cerebral hemispheres and T2RMRI, respectively. There was only a limited space in which to gain access to infracallosal DACAA below the PC point to establish proximal control by the anterior interhemispheric approach. Conclusions: When the approach is made above the PC point, an anterior callosotomy might be necessary to establish proximal control before final aneurysm dissection and clip placement is completed. The PC point is an important surgical landmark in planning the surgical strategy for treating infracallosal distal DACAA.