212 



Right 



Left 



Total 



Right 



Left 



Total 



Number. Artery in front 



155 

 139 

 294 



71 



72 



66 = 42,5 

 84 = 60,4 

 15(r= 51 



27 = 38,3 % 

 49 = 69,4 „ 



Classified according to Sex. 

 Male 

 Nerve in front. 

 70 = 45,1 o/o 



32 = 23 



143 76 = 53,1 



102 = 34,6 „ 



Female. 

 38 = 35,5 o/o 

 17 = 23,6 „ 

 "55"= 38,4 „ 



Mixed. 



19 = 12,2 0/, 



21_=15,1 „ 



40 = 13,6 „ 



5 = 7 

 3 = 4,1 

 ~8~= 5,5 



No artery. 

 



^= 1.4 % 

 2 = 0,6 „ 



l = l>4 0/o 

 S_= 4,1 „ 



4 = 2,7 „ 



Classified according to Side. 

 Right. 



Male 



Female 

 Total 



Male 



Female 



Total 



The difference between the sexes is of no great importance. What 

 is of most value is that on the left the artery is in front in nearly 

 two thirds of the cases, and on the right in less than half. How to 

 deal with the mixed cases, that is to say those in which the artery 

 has a branch on each side of the nerve, and, more raresly when the 

 nerve has a branch on each side of the artery, is very perplexing. 

 I have adopted the principle of ignoring minute branches. If the 

 smallest twigs were always counted the number of mixed cases would 

 be much greater. It may be noted that the artery is absent only 

 once on the right side and five times on the left. 



Opposite 3 Lumbar Y. 

 Disc between 3^'^ & 4*'' 



4'^ Lumbar V. 

 Disc between 4*"^ & ö*"» 



5<'i Lumbar V. 



The Division of the Abdominal Aorta 



Males 

 7= 3,2 0/, 



6 = 2,7 

 164 = 75,9 

 11=5 

 28 = 12,9 



Total 216 



Females 



2=2 0/ 



5 = 5,1 „ 



74 = 76,2 „ 



8 = 8,2 „ 



8= 8,2 „ 



97 



Total 



9= 2,8 0/, 



11 = 3.5 „ 



238 = 76 „ 



19= 6 „ 



36 = 11,5 „ 



Of the 238 cases in which the division occurred opposite the 

 fourth lumbar vertebra, in 50 it was at the top of the vertebra, in 



