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Lymph is present throughout the body, and circulates through lymphatic vessels. These drain into and from lymph nodes â afferent vessels drain into nodes, and efferent vessels from nodes. When lymph fluid enters a node, it drains into the node just beneath the capsule in a space called the subcapsular sinus. The subcapsular sinus drains into trabecular sinuses and finally into medullary sinuses.
  The main function of lymph nodes is to act as a drainage system by absorbing and expelling proteins, dead cells, bacteria and other waste products from the body.Basically they clean and filter the lymph before it is returned to the blood.ransportation of the lymph is the most important function of the lymphatic vessels of the lymph nodes. The lymph nodes then act as filters to filter out impurities from the b â¦ lood vessels and produce antibodies.