INBDE (Integrated National Board Dental Examination) Practice Exam

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Where do the lymphatic duct and thoracic duct empty?

Junction of subclavian and IJV
Superior vena cava
Right atrium
Pulmonary veins

The correct answer is: Junction of subclavian and IJV

The lymphatic duct and thoracic duct empty at the junction of the subclavian vein and the internal jugular vein (IJV). This point is known as the venous angle, where lymphatic fluid re-enters the bloodstream. This location allows for the return of lymphatic fluid back into circulation, completing the lymphatic cycle. The other options are incorrect because: - The superior vena cava receives blood from the head, neck, upper extremities, and chest, but it is not the site where the lymphatic duct and thoracic duct empty. - The right atrium is a chamber of the heart that receives deoxygenated blood from the systemic circulation, not lymphatic fluid. - The pulmonary veins carry oxygenated blood from the lungs to the left atrium of the heart, and they are not involved in the drainage of lymphatic fluid.