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What is Arch of aoa begins and ends at which level: and explain in detail?
The arch of the aoa (Transverse Aoa) begins at the level of the upper border of the second sternocostal aiculation 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 fouh thoracic veebra, at the lower border of which it becomes continuous with the descending aoa.