<prompt> Inferior thyroid vein drains intoInternal jugular veinSuperior vena cavaBrachiocephalic veinEXternal jugular vein  <response>: The inferior thyroid veins emerge at the lower border of the isthmus. They form a plexus in front of the trachea and drain into the left brachiocephalic vein. Ref: BD Chaurasias HUMAN ANATOMY, Volume 3, 4th edition. 