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The first part of the right subclavian artery passes from the bifurcation of the right brachiocephalic trunk deep to the right sternocostal joint to the medial edge of the scalenus anterior muscle. In taking this course, it arches over the suprapleural membrane and apex of the lung.
Its relations during this course are:
The first part of the right subclavian artery gives off three branches, from proximal to distal:
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