Ishida M, Sakata N, Ise I, Ono T, Shimura M, Ishii K, Murakami M, Takadate T, Aoki T, Kudo K, Ohnuma S, Fukase K, Ohtsuka H, Mizuma M, Hayashi H, Nakagawa K, Morikawa T, Motoi F, Naitoh T, Unno M
Folia Morphol (Warsz). 2018;77(2):286-292. doi: 10.5603/FM.a2017.0089. Epub 2017 Oct 24.
Anatomical knowledge of the duodenojejunal flexure is necessary for abdominal surgeries, and also important for physiologic studies about the duodenum. But little is known about the anatomy of this region in mammals. Here, we examined comparative anatomy to understand the anatomical formation of the duodenojejunal flexure in mammals.
The areas around the duonenojejunal flexure were ob-served in mouse, rat, dog, pig, and human, and the anatomical structures around the duodenojejunal junction in the animals were compared with those in human.
The superior and inferior duodenal folds, and the superior and inferior duodenal fossae were identified in all examined humans. In pig, the structures were not clearly identified because the duodenum strongly adhered to the retroperitoneum and to the mesocolon. In mouse, rat, and dog, only the plica duodenocolica, which is regarded as the animal counterpart of the superior duo-denal fold in human, was identified, and other folds or fossae were not observed, probably because the duodenum was not fixed to the parietal peritoneum in those animals. Transection of the plica duodenocolica could return the normally rotated intestine back to the state of non-rotation in rat.
This study showed the anatomical similarities and dissimilarities of the duodenojejunal flexure among the mammals. Anatomical knowledge of the area is useful for duodenal and pancreatic surgeries, and for animal studies about the duodenum. (Folia Morphol 2018; 77, 2: 286-292).
十二指肠空肠曲的解剖学知识对腹部手术至关重要，对十二指肠的生理学研究也很重要。但对于哺乳动物该区域的解剖结构却知之甚少。在此，我们通过比较解剖学来了解哺乳动物十二指肠空肠曲的解剖学形成。
观察了小鼠、大鼠、狗、猪和人类十二指肠空肠曲周围区域，并将动物十二指肠空肠连接处的解剖结构与人类的进行比较。
在所有被检查的人类中均识别出十二指肠上、下皱襞以及十二指肠上、下隐窝。在猪中，由于十二指肠与腹膜后组织和结肠系膜紧密粘连，这些结构无法清晰识别。在小鼠、大鼠和狗中，仅识别出被认为相当于人类十二指肠上皱襞的十二指肠结肠襞，未观察到其他皱襞或隐窝，这可能是因为这些动物的十二指肠未固定于壁腹膜。切断大鼠的十二指肠结肠襞可使正常旋转的肠管恢复到未旋转状态。
本研究展示了哺乳动物十二指肠空肠曲的解剖学异同。该区域的解剖学知识对十二指肠和胰腺手术以及十二指肠的动物研究很有用。（《形态学杂志》2018年；77卷，第2期：286 - 292页）
