Normal anatomic variation of anterior cerebral artery are analyzed in 100 normal carotid arteriogram (male; 73, female; 27) which were done at Department of Radiology, Seoul National University Hospital during period of August 1965 to June 1971. With lateral view of arteriogram, the anterior cerebral artery is divided to 4 parts. Part I ofthe anterior cerebral artery beings at its derivation from internal carotid artery and ends before the vesselenclose the genu of corpus callosum. Part II surrounds the genu of teh corpus callosum. Part III begins after thecurve of part II is completed, and continues to the first sign of tortuosity in the pericallosal artery Part IVextends to the most distal part of that vessel. The configuration of the each part and origin of branches areanalyzed as follows; Part I shows superior and posterior convexity in 82%, semivertical straight course in 9%, andstraight horizontal course in 8%. Part II shows gentle curve in 51%, acute angulation in 14%, wide curve in 19%,and square pig nose form in 16%. Part III forms a round and smooth course with its convexity upward in 77%. PartIV is biphasic or triphasic in about equal incidence. The branches of anterior cerebral artery arise from thevariable sites. The frontopolar artery arise from the part I of anterior cerebral artery in 47%, from the part IIin 11%, and from callosomarginal artery in 22%. The callosomarginal artery arise from the part I in 15%, from thepart II in 83%, and part III in 2%. The paracentral lobule is supplied by only on vessel, callosomarginal artery,in 51%;and by two arteries, paracentral branch of pericallosal artery and callosomarginal artery, in 46%.