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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.
Describe the types of lymph vessels and lymph trunks and their roles. 1  The lymph trunks drain into the lymph ducts, which in turn return lymph to the blood by emptying into the respective subclavian veins.  There are two lymph ducts in the bodyâthe right lymph duct and the thoracic duct.