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作者通过研究直肠下动脉的解剖分布和肛管的血液供应探讨肛裂多发生于肛管后正中区的原因。采用尸体髂动脉、肠系膜下动脉造影(41例)、血管造影后病理研究(10例)及肛管不同部位的血管形态研究(20例)等方法,得出以下结果: 41例血管造影表明直肠下动脉呈两种分布:Ⅰ型;后正中区无或仅有很少动脉分支,41例中占35例(85.4％),Ⅱ型:直肠下动脉分布后正中区,与肛管其它部位相比较无差别,41例中占6例(14.6％)。后正中区的血供,取决于Ⅱ型动脉的存在。肛管皮下和肛门内括约肌毛细血管的研究表明:前正中区血管密度最高,两侧区与前区相似。前正中区与后正中区血管总数的比较是极为重要的。3例后正中区的血管数仅为前正中区的35％;仅4例后正中
The authors investigate the reasons for the occurrence of anal fissure in the middle of the anal canal by studying the anatomic distribution of the inferior rectal artery and the blood supply to the anal canal. The iliac artery, inferior mesenteric artery angiography (41 cases), angiographic post-angiographic study (10 cases) and angiogenesis in different parts of the anal canal (20 cases) were used to obtain the following results: 41 cases of angiography showed that the rectum There were two types of inferior arteries: type Ⅰ; posterior median region with few or no arterial branches, 35 cases (85.4%) in 41 cases, type Ⅱ: middle region of inferior rectal artery after distribution, with other parts of anal canal Compared with no difference, in 41 cases accounted for 6 cases (14.6%). After the middle of the blood supply, depends on the presence of type Ⅱ artery. Anal subcutaneous and anal sphincter capillary studies have shown that: the former middle of the highest vascular density, both sides of the area and the former similar. The comparison of the total number of vessels in the anterior midline and posterior midline is of paramount importance. After 3 cases, the number of blood vessels in the middle region was only 35% of the anterior median region; only 4 patients were in the middle