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[The position of the aortic bifurcation in humans].

ABSTRACT We followed the position of aorta bifurcation in the arteriograms of 253 persons of known sex and age and in four human foetus. There exists a statistically relevant difference between sex and age. Bifurcation has a higher position in women than in men. In foetus the bifurcation position is placed relatively high--in the 3rd lumbal vertebra--in adults the bifurcation position is in the 4th lumbal vertebra. We can observe a slow decrease of aortal bifurcation to the distal direction in humans after 50 years of age. This descent is statistically significant.

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    ABSTRACT: The object of this retrospective study was to determine the sites of abdominal aortic bifurcation and inferior vena cava confluence in relation to age and sex. The study group comprised 180 subjects (90 males and 90 females) divided into 9 groups by age (in decades). The positions of the aortic bifurcation and the inferior vena cava confluence were evaluated by CT, and linear regression models were fitted to the data. The positions of the aortic bifurcation and venous confluence showed a highly significant downward shift with increasing age (p = 0.0001). The shift was more pronounced in women. The mean site of the aortic bifurcation for the whole group was at lower L4 (range, upper L3 to upper S1); in males, it was at upper L4 (range, upper L3 to upper L5), and in females at lower L4 (range, upper L3 to upper S1). The mean site of the venous confluence for the whole group was at disc L4-L5 (range, lower L3 to upper S1); in males, it was at disc L4-L5 (range, upper L4 to disc L5-S1), and in females at disc L4-L5 (range, lower L3 to upper S1). Thus, the aorta and the inferior vena cava can extend as low as the level of S1. These data are of relevance in laparoscopic procedures, especially in laparoscopic lumbar discectomy.
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