Aortic bifurcation

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  Aortic bifurcation
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  Aortic bifurcation
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  Aortic bifurcation

Aortic Bifurcation

The aortic bifurcation is a critical anatomical feature in the human body where the abdominal aorta divides into the common iliac arteries. This bifurcation occurs at the level of the fourth lumbar vertebra (L4), although it can vary slightly among individuals.

Anatomy

The aortic bifurcation marks the end of the abdominal aorta, which is the continuation of the thoracic aorta after it passes through the aortic hiatus of the diaphragm. The abdominal aorta descends anterior to the vertebral column and terminates by bifurcating into the left and right common iliac arteries.

Location

The bifurcation typically occurs at the level of the L4 vertebra, just above the sacral promontory. It is located slightly to the left of the midline of the body. The bifurcation is anterior to the vertebral column and is surrounded by several important structures, including the inferior vena cava, which lies to its right.

Branches

The aortic bifurcation gives rise to the left and right common iliac arteries. Each common iliac artery further divides into the internal iliac artery and the external iliac artery. These arteries supply blood to the pelvis and lower limbs.

Clinical Significance

The aortic bifurcation is a site of clinical importance for several reasons:

• Atherosclerosis: The bifurcation is a common site for the development of atherosclerosis, which can lead to peripheral artery disease.
• Aneurysms: An aortic aneurysm can occur at the bifurcation, known as an aortoiliac aneurysm, which may require surgical intervention.
• Surgical Access: The bifurcation is a landmark for various surgical procedures, including aortoiliac bypass surgery.

Related Pages

• Abdominal aorta
• Common iliac artery
• Internal iliac artery
• External iliac artery
• Aortic aneurysm
• Peripheral artery disease

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