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The arch of the aorta (Transverse Aorta) begins at the level of the upper border of the second sternocostal articulation of the right side, and runs at first upward, backward, and to the left in front of the trachea; it is then directed backward on the left side of the trachea and finally passes downward on the left side of the body of the fourth thoracic vertebra, at the lower border of which it becomes continuous with the descending aorta.
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It thus forms two curvatures: one with its convexity upward, the other with its convexity forward and to the left. Its upper border is usually about 2.5 cm. below the superior border to the manubrium sterni.
The Arch of Aorta (Aortic Arch) is covered anteriorly by the pleura and anterior margins of the lungs, and by the remains of the thymus.
As the vessel runs backward its left side is in contact with the left lung and pleura.
Passing downward on the left side of this part of the arch are four nerves; in order from before backward these are, the left phrenic, the lower of the superior cardiac branches of the left vagus, the superior cardiac branch of the left sympathetic, and the trunk of the left vagus.
As the left vagus nerve crosses the arch, it gives off its recurrent branch, which hooks around below the vessel and then passes upward on its right side.
The highest left intercostal vein runs obliquely upward and forward on the left side of the arch, between the phrenic and vagus nerves.
Below are the bifurcation of the pulmonary artery, the left bronchus, the ligamentum arteriosum, the superficial part of the cardiac plexus, and the left recurrent nerve.
The ligamentum arteriosum connects the commencement of the left pulmonary artery to the aortic arch.
This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Aortic_arch". A list of authors is available in Wikipedia.|