The drainage of body tissues is carried out by the lymphatic and venous systems. Without this drainage edema and hypertrophy of cutaneous and epithelial tissues would result.
Tiny tubes, called lymphatic vessels, pick up and carry the intercellular liquid (lymph) from the tissues of the body into the lymphatic trunks (bigger-caliber lymphatic vessels), which convey this fluid into the either of the two lymphatic ducts (right and left). Finally, these ducts drain the intercellular lymph into the subclavian veins, which are located in the shoulder. The subclavian veins (right and left) carry the lymph and deoxygenated blood from the arm, draining it into the brachiocephalic vein.
In the head, the drainage of excess cerebrospinal fluid is conducted by the dural sinuses and the internal jugular vein.