The veins in the thyroid gland and the veins in the thyroid gland are refluxed to the intra-cervical veins, while the subthyroid veins are directly refluxed to the first arm veins.
The superior thyroid vein and the middle thyroid vein all flow back to the internal jugular vein, while the inferior thyroid vein directly flows back to the brachiocephalic vein<br>