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The aorta (/ eɪ ˈ ɔːr t ə / ay-OR-tə; pl.: aortas or aortae) is the main and largest artery in the human body, originating from the left ventricle of the heart, branching upwards immediately after, and extending down to the abdomen, where it splits at the aortic bifurcation into two smaller arteries (the common iliac arteries).
The thoracic aorta is a continuation of the descending aorta and becomes the abdominal aorta when it passes through the diaphragm. The initial part of the aorta , the ascending aorta , rises out of the left ventricle, from which it is separated by the aortic valve .
The aortic root is the portion of the aorta beginning at the aortic annulus and extending to the sinotubular junction. It is sometimes regarded as a part of the ascending aorta, [ 2 ] and sometimes regarded as a separate entity from the rest of the ascending aorta.
The descending aorta anatomically consists of two portions or segments, the thoracic and the abdominal aorta, in correspondence with the two great cavities of the trunk in which it is situated. Within the abdomen, the descending aorta branches into the two common iliac arteries which serve the pelvis and eventually legs.
The abdominal aorta lies slightly to the left of the midline of the body. It is covered, anteriorly, by the lesser omentum and stomach , behind which are the branches of the celiac artery and the celiac plexus ; below these, by the lienal vein (splenic vein), are the pancreas , the left renal vein , the inferior part of the duodenum , the ...
The aorta is the largest blood vessel in human body. The aorta is the root systemic artery (i.e., main artery). In humans, it receives blood directly from the left ventricle of the heart via the aortic valve. As the aorta branches and these arteries branch, in turn, they become successively smaller in diameter, down to the arterioles.
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The aortic sac is the embryological precursor of the proximal portion of the aortic arch. It is chronologically the first portion of the aorta to form, and appears as a dilation superior to the truncus arteriosus. Between the two horns of aortic sac, right horn gives rise to the brachiocephalic artery.
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