Begininng :-enters the abdomen through the aortic opening..at T12 .
Course:-it descends downward & vertically …on the ant.surface of bodies of lumbar vertebrae…at the level of L4 it divides into two common iliac arteries.Abdominal aorta
Relations:-Ant:-median arcuate ligament…ceiliac trunk..lesser omentum…sup.mesenteric artery..head of pancreas…uncinate process…3rd part of duodenum…root of mesentery of small intestine..Lt renal vein…splenic vein…inf.mesenteric vein…parietal peritoneum.
Post:-lumbar vertebrae & intervertebral discs..3rd & 4th lumbar veins.
Note :-1st & 2nd lumbar veins on Rt side unites to form azygous vein..on left side they form hemi azygous vein.
On each side:-sympathetic chain+crura of diaphragm.
On Rt side:-inf.vena cava…azygous vein..cisterna chyli.
On Lt side:-4th part of duodenum..head of pancreas
4th part of duodenum
3rd part of duodenumCeiliac trunk
head of pancreas
Sup.mesenteric artery & vein
Ant relation of aorta
حتى بالجثه هالشكل ^___^
Branches:-1)visceral (ant)branches:-ceiliac …sup.mesenteric….inf.mesenteric.
2)visceral(lat)branches:-renal..suprarenal…testicular or ovarian vein.
3)abdominal branches:-4 lumbar arteries…inf.phrenic artery.
4)terminal branches:-two common iliac arteries…median sacral artery.
Note :-median sacral artery arises from back of aorta on L5 ..gives branches to rectum.
Note :-inf.phrenic artery lies on L1.
Notes on last pic:-
**Rt 1st & 2nd lumbar veins unite to form the Rt ascending lumbar vein… subcostal vein …azygous vein ..intercostal veins…SVC..Rt atrium of heart.**Lt 1st & 2nd lumbar veins…Lt ascending lumbar veins..subcostal vein..hemiazygous veins…intercostal veins..
Note :-thoracic duct crosses from Rt to Lt .(imp)
Note :-renal artery arises in L2.
Note :-aorta lies 2cm above transpyloric plane (L1).
& 2cm below umbilicus.
Note :-gonadal arteries Rt :-lies deep to 3rd part of duodenum..on inf.vena cava psoas…genitofemoral nerve.
In Lt side there is no inf.vena cava.
Renal arises med…gonadal lat.
Passes on psoas …genitofemoral n.Int.iliac artery :-
