解剖一具老年男尸时,见其乙状结肠反位伴有血管变异。降结肠由脾曲下降至髂嵴水平,移行为乙状结肠。其全长为79cm。可分为四段(附图):1.左降段,长约9.0cm。由左髂嵴水平转向右前下,贴腹后壁稍向下斜行至第四、五腰椎水平;2.水平段,长约17.5cm。 Anatomy of an elderly male corpse, see the sigmoid colon transposition associated with vascular variation. Descending colon from splenic song down to the level of iliac crest, migration for the sigmoid colon. Its total length is 79cm. Can be divided into four sections (with photos): 1. Left descending section, about 9.0cm. From the left iliac crest level to the right front, the posterior abdominal wall obliquely down to the fourth and fifth lumbar level; 2 horizontal section, about 17.5cm.