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bifurcation (plural bifurcations) ( 1 biology) A division into two branches. ( 2 by extension) Any place where one thing divides into two. 3  The act of bifurcating; branching or dividing in two.  Either of the forks or other branches resultant from such a 1  division. (geography) A place where two roads, tributaries etc. part or meet.
The aortic bifurcation is the point at which the abdominal aorta bifurcates into the left and right common iliac arteries.The aortic bifurcation occurs usually at the level of the fourth lumbar vertebrae (L4 Vertebra), just above the confluence of the left and right common iliac veins.he aortic bifurcation occurs usually at the level of the fourth lumbar vertebrae (L4 Vertebra), just above the confluence of the left and right common iliac veins.