12.7 Flashcards
Abdominal aorta starts in midline at T___/L___, and ends anterior to L___, by dividing into right and left common iliac arteries
T12/L1
L4
Main branches of abdominal aorta:
- 3 anterior (unpaired) (for GI viscera).
- 3 paired branches off side (for adrenals, kidneys and ureters)
- Series of paired posterior branches (for walls of abdomen).
What are the 3 unpaired branches off the front of AA?
Celiac trunk - to foregut structures.
SMA - to midgut structures.
IMA - to hindgut structures.
Foregut derivatives (supplied by celiac trunk):
Liver, gall bladder, pancreas and spleen.
Tubular GI parts = abdominal oesophagus, stomach and half of duodenum as far as major duodenal papilla.
Midgut derivatives (SMA supply)
Tubular - everything from major duodenal papilla to proximal part of splenic flexure.
Hindgut (IMA supply):
Tubular - everything from proximal part of splenic flexure to first part of anal canal.
Origin of celiac trunk:
Approx T12, usually superior border of pancreas.
3 branches of celiac trunk:
Left gastric artery, splenic artery and common hepatic artery.
Instead of arcades and vasa recta, the colic arteries feed into a ___ artery
Marginal
Origin of SMA:
Off front of AA at approx 1 cm below celiac trunk, approx level of L1.
Origin of IMA:
Starts at inferior border of the third part of duodenum, approx L3
Portal system of veins drains:
Tubular GI tract, gall bladder, pancreas AND spleen (NOT liver).
Origin of portal vein:
Behind neck of pancreas at level of L2
The portal vein is formed when ___ vein joins the ___ ___ vein
Splenic vein joins superior mesenteric vein
All structures supplied by branches from FRONT of AA drain into ___ ___
Portal vein
