Which vessel carries deoxygenated blood from the brain back to the right side of the heart?

The vessel that carries deoxygenated blood from the brain back to the right side of the heart is the jugular vein. Specifically, the internal jugular vein collects blood from the brain and neck and drains it into the brachiocephalic vein, which then empties into the superior vena cava. This blood ultimately returns to the right atrium of the heart.