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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.
It is here that lymph re-enters blood circulation. Returning lymph to the blood helps to maintain normal blood volume and pressure. It also prevents edema, the excess accumulation of fluid around tissues. Large lymphatic vessels are composed of three layers.ymph is first taken up by lymphatic capillaries and flows to lymphatic vessels. Lymphatic vessels direct lymph to lymph nodes and along to lymphatic trunks. Lymphatic trunks drain into one of two lymphatic ducts, which return lymph to the blood via the subclavian veins.