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The blood supply to the colon comes from the superior and inferior mesenteric arteries. Part of the rectum is supplied by the internal iliac system and this anastamoses with the lower branches of the inferior mesenteric system.
Lymphatic fluid from the spleen empty into the lymph nodes at the splenic hilum. The lymph then passes through the pancreaticosplenic lymph nodes and then empties into the celiac nodes. The splenic nerve supply is derived from the celiac plexus (refer to Stomach Nerves).he spleen is a soft and spongy organ with a thin elastic capsule around it covering the inner part known as the splenic pulp. Parts of the inner capsule carry the blood vessels and extends into the pulp.