伤寒病病变造成的肠穿孔，主要发生在回肠壁的对系膜缘，了解这一特点，当外科施行肠穿孔修补术时，寻找穿孔部位十分有利。为什么伤寒病变穿孔多发生在回肠的对系膜线？这首先要了解小肠（空。回肠）的结构。小肠包括十二指肠、空肠和回肠，其中空回肠是消化管中最长的一段，? Intestinal perforation caused by typhoid fever lesions, mainly in the ileum wall of the mesangial margin, to understand this feature, when the surgical implementation of intestinal perforation repair, looking for perforation site is very beneficial. Why typhoid lesions occur more often in the ileum on the mesangial line? This should first understand the structure of the small intestine (empty ileum). Small intestine, including the duodenum, jejunum and ileum, the ileum is the longest in the digestive tract,?