Jugular vv.

The jugular veins are veins that bring deoxygenated blood from the head back to the heart via the superior vena cava.

There are two sets of jugular veins: external and internal.

The left and right external jugular veins drain into the subclavian veins. The internal jugular veins join with the subclavian veins more medially to form the brachiocephalic veins. Finally, the left and right brachiocephalic veins join to form the superior vena cava, which delivers deoxygenated blood to the right atrium of the heart.[1]

Internal:

The internal jugular vein is formed by the anastomosis of blood from the sigmoid sinus of the dura mater and the common facial vein. The internal jugular runs with the common carotid artery and vagus nerve inside the carotid sheath. It provides venous drainage for the contents of the skull.

External:

The external jugular vein runs superficially to sternocleidomastoid.