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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.
1 Lymphatic System The lymphatic system comprises a network of lymphatic vessels, lymph nodes, and several other organs, distributed throughout the body as a network. 2  These structures collect fluid called lymph from the body and return it to the blood stream, thus maintaining the bodyâs fluid balance.he lymphatic system, on the other hand, is an organ system that functions through lymphatic vessels and structures. Furthermore, the lymphatic system is associated with the circulatory system, whereas the immune system is connected to the nervous system as well as the endocrine system.