College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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What are the main lymphatic ducts in the human body?

Thoracic duct and left lymphatic duct
Right lymphatic duct and thoracic duct
Subclavian duct and iliac duct
Axillary duct and cervical duct

The correct answer is: Right lymphatic duct and thoracic duct

The main lymphatic ducts in the human body consist of the thoracic duct and the right lymphatic duct. The thoracic duct is the largest lymphatic vessel, responsible for draining lymph from the left side of the head, neck, chest, left arm, and the entirety of the lower body. It empties into the venous system at the junction of the left subclavian and left internal jugular veins. The right lymphatic duct, on the other hand, is smaller and drains lymph from the right side of the head, neck, right arm, and part of the chest, emptying into the venous system at the junction of the right subclavian and right internal jugular veins. Understanding the roles of these two ducts is crucial for comprehending how lymph is returned to the circulatory system, highlighting their significance in maintaining fluid balance and immune function. The other choices represent ducts or combinations that do not exist or are not recognized as primary lymphatic ducts, further establishing the importance of the thoracic duct and right lymphatic duct in the anatomy of the lymphatic system.