Lymph from what body areas enters the general circulation by way of the thoracic duct?

The right lymphatic duct drains the right arm, right shoulder area, and the right side of the head and neck.

The left lymph duct, or thoracic duct, drains everything else, including the legs, GI tract and other abdominal organs, thoracic organs, and the left side of the head and neck and left arm and shoulder.

These ducts then drain into the subclavian veins on each side where they join the internal jugular veins to form the brachiocephalic veins.

If he has had those "for as long as he can remember" they probably are actually not something serious. usually swollen lymph nodes point out an infection or some ailment technique - yet on account that they have been there for an prolonged time it may desire to easily be a reaction to allergens interior the ecosystem. Ask him to circulate to the healthcare expert and get appeared at if he hasn't already.