The new Wonders of Wildlife museum houses live mammals, fish and birds as well as traditional museum displays. The 92,000-square-foot facility is located next to Bass Pro Shops in Springfield.
  Is the anatomical space behind (retro) the abdominal cavity.Structures that lie behind the peritoneum are termed retroperitoneal.   Kidneys, Bladder, Pancreas, Vena C â¦ ava, Aorta, parts of the Duodenum, portions of the Colon, Reproductive organs.
Making the world better, one answer at a time. Lymph nodes are oval-shaped organs of the lymphatic system that are throughout the body. Sub centimeter retroperitoneal lymph nodes are lymph nodes smaller than 1 cm, inside the area known as the retrooeritoneum, that are most likely cancerous.mall, rounded structures along the small vessels of the lymphatic system that are part of the immune system. Lymph nodes are tiny spherical structures the size of a pin hea â¦ d in groups into which the lymphatic vessels drain through afferent vessels.