Abdominal aorta - Origin , course , branches - USMLE Step 1 Videos

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Abdominal aorta - Origin , course , branches - USMLE Step 1 : Anatomy medical animations

Abdominal aorta
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The abdominal aorta is the main blood vessel in the abdominal cavity that transmits oxygenated blood from the thoracic cavity to the organs within the abdomen and to the lower limbs.

Summary
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origin: continuation of descending thoracic aorta at T12

course: descends anterior and slightly to the left of the lumbar vertebral bodies

branches (unpaired)
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coeliac artery (L1 upper border)
superior mesenteric artery (L1 lower border)
inferior mesenteric artery (L3)
median sacral artery

branches (paired)
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middle adrenal arteries
renal arteries (L1-L2)
gonadal arteries (between L2 and L3)
inferior phrenic arteries
lumbar arteries

termination:
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bifurcates into right and left common iliac arteries at L4
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