human_reference_atlas part of Homo sapiens small intestine duodenum http://upload.wikimedia.org/wikipedia/commons/b/b3/Tractus_intestinalis_duodenum.svg https://ccf-ontology.hubmapconsortium.org/objects/v1.2/VH_F_Small_Intestine.glb https://ccf-ontology.hubmapconsortium.org/objects/v1.2/VH_M_Small_Intestine.glb duodenal VHOG:0000052 proximal intestine SCTID:181247007 UMLS:C0013303 EFO:0000851 uberon MESH:D004386 duodenum UBERON:0002114 upper intestine EV:0100073 NCIT:C12263 GAID:284 BTO:0000365 CALOHA:TS-0214 MA:0000338 AS MAT:0000044 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 duodenum AAO:0010402 MIAA:0000044 In fish, the divisions of the small intestine are not as clear, and the terms anterior intestine or proximal intestine may be used instead of duodenum. EMAPA:18852 The fixed portion of the small intestine deeply lodged in the posterior wall of the abdomen and extending from the pylorus to the beginning of the jejunum. [Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] Wikipedia:Duodenum XAO:0000236 In humans, the duodenum is a hollow jointed tube about 10-15 inches (25-38 centimetres) long connecting the stomach to the jejunum. It begins with the duodenal bulb and ends at the ligament of Treitz. subdivision of digestive tract