本文观察并测量了50例肠系膜的空回肠动脉弓及直动脉,见从起始端到终端,每1/5肠段动脉弓的级数依次为2-3-3-4-3。 本研究显示:回肠段的直动脉比空肠多,从空回肠始端到终端,直血管的长度起初逐渐增加,继而逐渐减少。 综合各项观察结果,可以认为肠系膜内存在着一个动脉配布的过渡区,该区一般由第九小肠动脉供应。 This article observed and measured 50 cases of the ileum of the ileum and the right atrium of the mesenteric artery. From the beginning to the end, the sequence of the arterial arch in every one-fifth of the bowel was 2-3-3-4-3. This study shows that: ileum straight section of the arteries than the jejunum, starting from the ileum to the terminal, the length of the straight blood vessels initially increased gradually, and then gradually decreased. Based on the observations, it is assumed that there is a transition zone in the mesentery that is usually covered by the artery of the ninth small intestine.