INBDE (Integrated National Board Dental Examination) 2026 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1180

Where do the lymph from the upper left and lower body all drain?

Thoracic duct

The lymph from the upper left and lower body all drain into the thoracic duct. The thoracic duct is the largest lymphatic vessel in the body and is responsible for draining lymph from the left side of the head, neck, thorax, upper limb, and the entire lower body. It then empties into the left subclavian vein, allowing the lymph to re-enter the bloodstream. This makes the thoracic duct the correct choice for where the lymph from the upper left and lower body converge.

Options B, C, and D are not correct because the right lymphatic duct drains lymph from the right side of the head, neck, and thorax only. The left jugular vein and left brachiocephalic vein are blood vessels and are not directly involved in the drainage of lymphatic fluid.

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Right lymphatic duct

Left jugular vein

Left brachiocephalic vein

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