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Dissection of the posterior wall of the thorax

This diagram shows the aortic arch with a standard branching pattern of the great vessels, including the innominate (brachiocephalic) artery, left common carotid artery, and the left subclavian artery. The innominate artery branches into the right subclavian artery and the right common carotid artery. The first branch of the subclavian artery is the vertebral artery, which ascends behind the common carotid artery on both sides. (Contributed by Dr. Douglas Lanska. Source: Buchanon AM. Manual of Anatomy: Systematic and Practical, Including Embryology. Third edition. Volume 2. St. Louis: C.V. Mosby, 1917.)

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