Aorta

The aorta (generally pronounced [[IPA|[eɪˈɔːtə]]] or "ay-orta") 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 five segments/sections ^[1] ^[2] :

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 an elastic 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^[3] and frequently quickly fatal^[4]

External links

- Descending aorta
- Abdominal aorta

Citations

[1] Tortora, Gerard J: "Principles of Human W. & Karen A. Koos: Human Anatomy, second edition, page 479. Wm. C. Brown Publishing, 1994 (ISBN 0-697-12252-2)
[2] De Graaff, Van: "Human Anatomy, fifth edition", pages 548-549. WCB McGraw-Hill, 1998 (ISBN 0-697-28413-1)
[3] Samett EJ. http://www.emedicine.com/radio/topic44.htm Aorta, Trauma. eMedicine.com. Accessed on: April 24, 2007.
[4] Aortic Trauma in Scotland - A Population Based Study., European Journal of Vascular and Endovascular Surgery, Vol. 32, No. 6, pp. 686-689, 2006, No. PMID 16750920.

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