The portion of the GASTROINTESTINAL TRACT between the PYLORUS of the STOMACH and the ILEOCECAL VALVE of the LARGE INTESTINE. It is divisible into three portions: the DUODENUM, the JEJUNUM, and the ILEUM.
Small Intestine,Intestines, Small,Small Intestines
D005767
Gastrointestinal Diseases
Diseases in any segment of the GASTROINTESTINAL TRACT from ESOPHAGUS to RECTUM.