Pérez W, Lima M, Bielli A
Area de Anatomia, Facultad de Veterinaria, A Lasplaces 1620, Montevideo, Uruguay.
Folia Morphol (Warsz). 2008 Nov;67(4):286-91.
The intestines and mesentery of the nutria (Myocastor coypus) have not been fully described. In the present study 30 adult nutrias were studied using gross dissection. The small intestine was divided into the duodenum, jejunum and ileum as usual. The duodenum started at the pylorus with a cranial portion, which dilated forming a duodenal ampulla. The ileum was located within the concavity of the caecum and attached to the coiled caecum by means of the iliocaecal fold. The ascending colon had two ansae, one proximal and one distal. The proximal ansa was fixed to the caecum by the caecocolic fold. The base of the caecum and a short proximal part of the ascending colon belonging to the proximal ansa were attached to the mesoduodenum descendens. The distal ansa of the ascending colon had a proximal part which was sacculated and a distal part which was smooth. The two parts of the distal ansa of the ascending colon were parallel and joined by a flexure of variable localisation. The smooth part of the distal ansa of the ascending colon was attached to the initial portion of the descending colon by a peritoneal fold. The short transverse colon was directly attached to the mesoduodenum and greater omentum. In conclusion, we have described the anatomy of the intestines of the nutria and its mesentery in detail, and provided a nomenclature list adapted to the Nomina Anatomica Veterinaria.
海狸鼠（Myocastor coypus）的肠道和肠系膜尚未得到充分描述。在本研究中，对30只成年海狸鼠进行了大体解剖研究。小肠通常分为十二指肠、空肠和回肠。十二指肠始于幽门，有一个颅部，该颅部扩张形成十二指肠壶腹。回肠位于盲肠的凹陷内，并通过回盲襞附着于盘绕的盲肠。升结肠有两个袢，一个近端袢和一个远端袢。近端袢通过盲结肠襞固定于盲肠。盲肠底部和属于近端袢的升结肠近端短部分附着于十二指肠降部系膜。升结肠远端袢有一个近端部分呈囊状，一个远端部分光滑。升结肠远端袢的两部分平行，并通过位置可变的弯曲相连。升结肠远端袢的光滑部分通过腹膜皱襞附着于降结肠起始部。短横结肠直接附着于十二指肠系膜和大网膜。总之，我们详细描述了海狸鼠肠道及其肠系膜的解剖结构，并提供了一份符合《兽医解剖学命名法》的命名列表。
