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FIG 9. Schematic illustration indicates positioning of the probe to analyze 1, the extraforaminal part of nerve roots and the deep cervical artery; 2, the nerve roots at the interscalene triangle; 3, the trunks of the brachial plexus; 4, the cords of the brachial plexus by a supraclavicular approach; 5, the cords of the brachial plexus by an infraclavicular approach; and 6, the cords of the brachial plexus at the retropectoralis minor space.
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