where the lymph nodes circulation return
Lymph nodes are small bean-shaped structures that are usually less than 2.5 cm in length. They are widely distributed throughout the body along the lymphatic pathways where they filter the lymph before it is returned to the blood.Lymph nodes are not present in the central nervous system.There are three superficial regions on each side of the body where lymph nodes tend to cluster.ymph nodes are small bean-shaped structures that are usually less than 2.5 cm in length. They are widely distributed throughout the body along the lymphatic pathways where they filter the lymph before it is returned to the blood.