Posterior intercostal veins
venae intercostales posteriores
Those of the 4th to 11th spaces empty into the azygos and hemi-azygos system, which carries the blood to the superior vena cava. Those of the 1st space enter the brachiocephalic veins; those of the 2nd and 3rd (sometimes the 4th) join into the supreme intercostal vein.

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The full entry, with every field, sources, quiz and clinical correlations, is in the atlas.
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