Vena Sigmoideus is a medical term, which refers to a vein located in the sigmoid colon of the human body. Synonyms are words that have the same or nearly the same meaning as another word. Some of the synonyms for Vena Sigmoideus include sigmoid vein, vena rectosigmoid, and sigmoidal vein. Another synonym for this term is the inferior mesenteric vein, which is a blood vessel that drains the distal part of the colon and rectum. The vena sigmoideus is essential for the body's digestive system as it helps to remove waste products from the colon. When there are problems with this vein, there can be severe digestive complications, which require immediate medical attention.