The small intestine – divided into three sections, surrounded by a thin layer of muscle and covered with a special mucous membrane – is the part of the digestive tract where the nutrients are absorbed for distribution throughout the body. It consists of the approx. 24-cm-long duodenum, the approx. 3.5-m-long jejunum and the approximately 2.5-m-long ileum. In the right lower abdomen, the ileum issues laterally via a bulging structure (ileocoecal or Bauhin’s valve) into the cecum, the beginning of the large intestine.