Which parts of the body drain into the right lymphatic duct?

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Diagram of the human lymphatic system highlighting lymphatic vessels and major lymphoid organs, including lymph nodes, adenoids, tonsils, thymus gland, spleen, appendix, bone marrow, and ducts. — lymphatic system The human lymphatic system, showing the lymphatic vessels and lymphoid organs.

The right lymphatic duct is responsible for draining lymph from the upper right portion of the body. Specifically, it collects lymph from these areas and returns it to the bloodstream by emptying into the right subclavian vein.1

In contrast, the thoracic duct is responsible for draining the remainder of the body, eventually returning that lymph to the left subclavian vein.1