The lymphatic system is a network of vessels, nodes, and ducts that pass through almost all bodily tissues. It allows the circulation of a fluid called lymph through the body in a similar way to blood ...

The lymphatic system, made up of lymphoid tissues known as nodes and vessels, is part of the human immune system. It is involved in protecting the body against infection, by delivering immune cells, ...

The popliteal lymph nodes lie in the tissues behind a person’s knee. Many conditions can cause them to swell, such as infections and autoimmune conditions. It is rare for cancer to affect the ...