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Right brachiocephalic
vertebral vein, , brachiocephalic vein
left ventricle, aortic semilunar valve, ascending aorta, aoric arch, brachiocephalic artery, right subclavian artery, axillary artery, brachial artery, radial/ulnar artery, superficial palmar artery. medial vein of forearm, radial/cubital vein, basilic vein, brachial vein, axillary vein, subclavian vein, brachiocephalic vein, superior vena cava, heart (right atrium)
Here is the order it goes from right thumb to left thumb. 1. radial vein 2. brachial vein 3. axillary vein 4. left subclavian vein 5. brachiocephalic vein 6. superior vena cava 7. right atrium 8. right ventricle 9. pulmonary trunk 10. pulmonary arteries 11. lobar arteries 12. pulmonary capillaries 13. pulmonary venules 14. pulmonary veins 15. left atrium 16. left ventricle 17. aorta 18. brachiocephalic artery 19. right subclavian artery 20. axillary artery 21. brachial artery 22. radial artery
Blood goes from the vena cava into the right atrium of the heart
In the human, the brachiocephalic vein is formed by the union of the internal jugular and the subclavian vein on each side. In the cat, the brachiocephalic vein is formed by the union of the external jugular and the subclavian vein on each side.
The Thoracic Duct drains into the Left subclavian vein. Worth noting is there is a Right lymphatic duct which drains the lymph fluid from the right arm and the right side of the face. This dumps into the right subclavian vein. The Thoracic Duct drains everything else.
it first enters the blood stream at the left brachiocephalic vein (at junction of the left subclavian vein and the left internal jugular vein)
brachiocephalic vein
After the flow of blood(oxygenated) through the brachiocephalic(jugular) artery, the brachiocephalic (jugular) vein will return the blood(de-oxygenated) back to the anterior part of the vena cava. Then, into the right auricle. Et-cetera.
Superior vena cava.
It drains into the systemic (blood) circulation at the left brachiocephalic vein between the left subclavian and left internal jugular veins.