part of part_of small intestine 小肠(small intestine) duodenum 十二指肠 AAO:0010402 BTO:0000365 CALOHA:TS-0214 EFO:0000851 EMAPA:18852 EV:0100073 FMA:7206 GAID:284 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. 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. MA:0000338 MAT:0000044 MESH:A03.492.411.620.270 MIAA:0000044 OpenCyc:Mx4rv4LJDpwpEbGdrcN5Y29ycA 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). 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] UBERON:0002114 UMLS:C0013303 VHOG:0000052 XAO:0000236 duodenal galen:Duodenum proximal intestine proximal intestine uberon upper intestine upper intestine 上部小肠 上部小肠 十二指肠 在人类中，十二指肠是连接胃和空肠的大约10-15英寸(25-38厘米)长的中空连接管。它开始于十二指肠球部，结束于屈氏韧带。 在鱼类中，小肠的分裂不清楚，可以使用前肠或近端肠来代替十二指肠。 小肠的固定部分深深卡在腹部的后壁，从幽门延伸到空肠的开始。[Dorian_AF, Elsevier's_encyclopaedic_dictionary_of_medicine, Part_B:_Anatomy_(1988)_Amsterdam_etc.:_Elsevier][VHOG] 小肠的第一部分。在胃和十二指肠交界处，消化道是弯曲。十二指肠首先前行一小段距离，背向转弯，最后呈尾状，因此它是一个U形结构，有两个水平段（腹侧和背侧）。 近端肠 近端肠 subdivision of digestive tract 消化道分支