Abstract: Objective　To study the anatomy of anterior communicating artery complex (ACoAC) by supraorbital lateral-longitudinal fissure approach under microscope, and to provide anatomic reference for clinical clipping of the anterior communicating artery aneurysm (ACoAA).　Methods　ACoAC exposed through the supraorbital lateral-longitudinal fissure approach was observed under microscope in a total of 20 adult cadavers (40 sides) , and relevant data were measured and recorded.　Results　The supraorbital lateral-longitudinal fissure approach could better expose ACoAC. In particular, the superior and posterior superior areas of the anterior communicating artery could obtain a good surgical field of vision. The length of the anterior communicating artery (AComA) was (2.80±1.12) mm. The middle outer diameter was (1.79±0.82) mm. The distance from the anterior edge of optic chiasma was (4.59±2.22) mm. 　Conclusion　The supraorbital lateral-longitudinal fissure approach has the characteristics of good visual field and small brain tissue injury, which should consider favorably in treatment of the anterior communicating artery aneurysms (ACoAA) categorized as the superior and posterior superior type.

Key words: Supraorbital lateral-longitudinal fissure, 　ACoAC, 　ACoAA, 　 Applied anatomy