Aorta

Wikipedia, the free encyclopedia - Cite This Source

The aorta (pronounced "ay-OR-tuh") is the largest artery in the human body, originating from the left ventricle of the heart and bringing oxygenated blood to all parts of the body in the systemic circulation.

The course of the aorta

The aorta is usually divided into seven segments/sections :

• Ascending aorta — the section between the heart and the arch of aorta
• Arch of aorta — the peak part that looks somewhat like an inverted "U"
• Descending aorta — the section from the arch of aorta to the point where it divides into the common iliac arteries
• Thoracic aorta — the half of the descending aorta above the diaphragm
• Abdominal aorta — the half of the descending aorta below the diaphragm

Features

The aorta is a hard artery, and as such is quite distensible. When the left ventricle contracts to force blood into the aorta, the aorta expands. This stretching gives the potential energy that will help maintain blood pressure during diastole, as during this time the aorta contracts passively.

Diseases/pathology

• Aneurysm of sinus of Valsalva
• Aortic aneurysm - myotic, bacterial (e.g. syphilis), senile, genetic, associated with valvular heart disease
• Dissecting aortic aneurysm
• Aortic coarctation - pre-ductal, post-ductal
• Atherosclerosis
• Marfan syndrome
• Trauma, such as traumatic aortic rupture, most often thoracic and distal to the left subclavian artery and frequently quickly fatal

References

External links

• - Descending aorta
• - Abdominal aorta

Wikipedia, the free encyclopedia © 2001-2006 Wikipedia contributors (Disclaimer)
This article is licensed under the GNU Free Documentation License.
Last updated on Sunday March 02, 2008 at 12:11:32 PST (GMT -0800)
View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation