Also called the
lymphatic system, it is comprised of
lymphatic vessels that run throughout the body (with the
largest vessel being the thoracic duct, which collects a
large portion of the body's lymph); lymph nodes, located in the neck, armpit, groin, and inside the center of the chest and abdomen; the tonsils and adenoids, which are collections of lymphoid
tissue similar to lymph nodes; and the spleen and thymus, which are lymphoid organs.
Lymphatic vessels are a network of capillaries, ducts and
larger vessels that drain lymph (a fluid containing proteins, other chemicals and cells such as macrophages and lymphocytes) from body
tissues.