duodenum GAID:284 VHOG:0000052 BTO:0000365 CALOHA:TS-0214 MA:0000338 SCTID:181247007 UMLS:C0013303 MAT:0000044 EFO:0000851 The first part of the small intestine. At the junction of the stomach and the duodenum the alimentary canal is inflected. The duodenum first goes anteriorly for a short distance, turns dorsally, and eventually caudally, thus it is a U-shaped structure with two horizontal sections (a ventral and a dorsal one). FMA:7206 galen:Duodenum MESH:D004386 AAO:0010402 MIAA:0000044 EV:0100073 EMAPA:18852 Wikipedia:Duodenum XAO:0000236 NCIT:C12263 subdivision of digestive tract