brachiocephalic vein
superior vena cave
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.
subclavian vein
The internal jugular vein is formed from the sigmoid sinus (after receiving the lesser petrosal sinus) just after passing through the jugular foramen to become the internal jugular vein.
internal jugular!
In humans there is one external and one internal jugular vein. The internal jugular vein is much larger (about twice the diameter) of the external jugular. In the cat there are a pair of each vein but the external jugular vein is about twce as large as the internal. (Opposite of humans.)
it first enters the blood stream at the left brachiocephalic vein (at junction of the left subclavian vein and the left internal jugular vein)
It drains into the systemic (blood) circulation at the left brachiocephalic vein between the left subclavian and left internal jugular veins.
the subclavian vein
A dilatation in the upper part of the internal jugular vein near it's origin and lies in the jugular fossa in the base of the skull.....
Blood goes from the vena cava into the right atrium of the heart
The Brain
The subclavian vein is a major vein that drains blood from the upper extremities and returns it to the heart. There are two of these veins, and like all large veins supply large amounts of blood from the body.