A part of a major vein of the upper extremities or forelimbs that passes beneath the clavicle and is continuous with the axillary vein.
The subclavian vein is a continuation of the axillary vein (vein of the armpit) from the upper arm. A branch of the subclavian vein (right and left) extends from each arm. The vein then converges and extends from the first rib to the clavicle (collar bone), where it merges with the internal jugular vein to form the innominate. The subclavian veins are also important to the lymphatic system as a means of introcucing lymph back into the blood. The thoracic duct, which carries lymph, joins the left subclavian near the junction with the internal jugular vein. The lymphatic duct carries lymph to the right subclavian vein and also joins it near the junction with the internal jugular vein.