what are the two ducts in the lymphatic system that returns lymph to circulatory system
The left lymphatic duct, or thoracic duct, enters the circulatory system at the junction of the left jugular and subclavian veins; it returns lymph from the cranial left side of the body and caudal to the diaphragm.
The major lymphatic duct is the Thoracic Duct which returns lymph from the the whole body except from the right side of the head and the right arm/shoulder. These parts are drained by the Subclavian Trunk. Both vessels drain into the junction of the subclavian and jugular veins on their respective sides.