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Arch Surg. 2003;138:439.

	Since this article does not have an abstract, we have provided the first 64 words of the full text and any section headings.

The superior intercostal artery supplies the first two intercostal spaces from behind. The first thoracic sympathetic ganglion is large and lies behind the vertebral artery. A small twig, the ansa subclavii, passes in front of the subclavian artery to join the lowest cervical ganglion.

Source: Boileau Grant JC. A Method of Anatomy: Descriptive and Deductive. 5th ed. Baltimore, Md: Williams & Wilkins Co; 1952:530.