Michael Stelin Agnes, Rabi Suganthy
Assistant Professor, Department of Anatomy, Christian Medical College , Vellore, India .
Professor, Department of Anatomy, Christian Medical College , Vellore, India .
J Clin Diagn Res. 2015 Aug;9(8):AC04-7. doi: 10.7860/JCDR/2015/13850.6364. Epub 2015 Aug 1.
Sigmoid volvulus is a common etiological factor in acute large bowel obstruction. The increased length of sigmoid colon is attributed as one of the causes of sigmoid volvulus.
The aim of this study was to find the morphology of sigmoid colon in South Indian population using cadavers.
The present study was performed with 31 cadavers used for teaching purpose. The sigmoid colon was classified into classical, long-narrow and long- broad types by their disposition in the abdominal cavity. The sigmoid loop's relation to pelvic brim was also observed and grouped as pelvic and suprapelvic in position. The length of sigmoid colon along the mesenteric and antimesenteric border, height and width of sigmoid mesocolon in relation to the pelvic brim and the root of mesentery were measured in the study.
The study showed that the majority of the sigmoid colons fell into the classical type (47.6%). The sigmoid colon in pelvic position was significantly more prevalent. The mean length of sigmoid colon was 15.2 ± 4.4cm and 19.2 ± 6cm considering the pelvic brim and root of mesentery as reference points of measurement respectively. The mean length along antimesenteric border was 22.3 ± 7.9cm and 25 ± 8.7cm along the same reference points. The mean length of mesocolon height was 6.5 ± 3cm with reference to pelvic brim and 7.3 ± 3cm with reference to root of Sigmoid mesocolon respectively. The mean width of mesocolon was 7.4 ± 3cm (pelvic brim) and 8 ± 2cm (root of Sigmoid mesocolon) There was a positive correlation of sigmoid colon length with the height of the mesocolon. The gender analysis showed that males had statistically significant longer sigmoid colon and mesocolon.
This study documents that the South Indian population has a more classical type of sigmoid colon and that the anatomical dimensions of sigmoid colon and its mesocolon is significantly longer in males.
乙状结肠扭转是急性大肠梗阻的常见病因。乙状结肠长度增加被认为是乙状结肠扭转的原因之一。
本研究旨在通过尸体研究南印度人群乙状结肠的形态。
本研究使用31具用于教学目的的尸体。根据乙状结肠在腹腔内的位置，将其分为经典型、长窄型和长宽型。观察乙状结肠袢与骨盆缘的关系，并根据位置分为盆腔型和盆腔上型。在研究中测量了乙状结肠沿肠系膜缘和反肠系膜缘的长度、乙状结肠系膜相对于骨盆缘和肠系膜根部的高度和宽度。
研究表明，大多数乙状结肠属于经典型（47.6%）。盆腔位的乙状结肠更为常见。分别以骨盆缘和肠系膜根部为测量参考点，乙状结肠的平均长度为15.2±4.4cm和19.2±6cm。沿反肠系膜缘的平均长度分别为22.3±7.9cm和25±8.7cm（相同参考点）。乙状结肠系膜高度的平均长度分别以骨盆缘为参考点为6.5±3cm，以乙状结肠系膜根部为参考点为7.3±3cm。乙状结肠系膜的平均宽度为7.4±3cm（骨盆缘）和8±2cm（乙状结肠系膜根部）。乙状结肠长度与系膜高度呈正相关。性别分析表明，男性的乙状结肠和系膜在统计学上明显更长。
本研究证明，南印度人群的乙状结肠更具经典类型，男性乙状结肠及其系膜的解剖尺寸明显更长。
