The inferior thyroid veins two, frequently three or four, in number, arise in the venous plexus on the thyroid gland, communicating with the middle and superior thyroid veins.
They form a plexus in front of the trachea, behind the Sternothyreoidei.
From this plexus, a left vein descends and joins the left brachiocephalic vein, and a right vein passes obliquely downward and to the right across the brachiocephalic artery to open into the right brachiocephalic vein, just at its junction with the superior vena cava; sometimes the right and left veins open by a common trunk in the latter situation.
These veins receive esophageal tracheal, and inferior laryngeal veins, and are provided with valves at their terminations in the brachiocephalic veins.
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