非洲人乙状结肠比白人和印度人长，研究在南非做的找不到足够的东亚人？？？

来源: 志在千里于 2015-09-19 19:28:25 [档案] [旧帖] [给我悄悄话] 阅读数 : (6235 bytes)

回答: 听到过类似的说法，没有找到出处，也不知真假。盼望知道的网友给点提示。由吃与活于 2015-09-19 16:53:56

I couldn't find data on Japanese specifically but at least one study has looked at racial differences. This comparative study from 2011 Sigmoid colon morphology in the population groups of Durban, South Africa, with special reference to sigmoid volvulus

A total of 590 cadavers were examined (403 African, 91 Indian, and 96 White). Length and height of the sigmoid colon and mesocolon were significantly longer in Africans, and mesocolon root was significantly narrower in Africans.

What we don't know if this is acquired as a result of a diet high in roughage, or inherited.

The claim made about the Japanese colon is made by themselves, apparently as an explanation as to why they should not eat some Western foods.

Now since this study included Indian cadavers, and since Indians are considered South Asians, then it would appear that Africans have longer sigmoid colons than some South Asians.

Abstract

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2011 May;24(4):441-53. doi: 10.1002/ca.21100. Epub 2011 Apr 8.

Sigmoid colon morphology in the population groups of Durban, South Africa, with special reference to sigmoid volvulus.

Madiba TE¹, Haffajee MR.

Abstract

Sigmoid volvulus demonstrates geographical, racial, and gender variation. This autopsy study was undertaken to establish morphological differences of the sigmoid colon and its mesocolon in which the length and other characteristics were assessed. A total of 590 cadavers were examined (403 African, 91 Indian, and 96 White). Length and height of the sigmoid colon and mesocolon were significantly longer in Africans, and mesocolon root was significantly narrower in Africans. Mesocolic ratio for Africans, Indians, and Whites was 1.1 ± 0.8, 1.8 ± 0.7, and 1.9 ± 1.0, respectively. Africans had a significantly high incidence of redundant sigmoid colon with the long-narrow type and suprapelvic position predominating (P = 0.003); the opposite applied to the classic type. There was no difference in sigmoid colon length, mesocolon height, and width between males and females in all population groups. Among Africans, the long-narrow type was more common in males, and the classic and long-broad types were more common in females. Splaying of teniae coli and thickening of the mesentery were more common in Africans. Tethering of the sigmoid colon to the posterior abdominal wall was less common in Africans compared with other population groups. In conclusion, the sigmoid colon was longer, and the sigmoid mesocolon root was narrower in Africans compared with the other population groups, and the sigmoid colon had a suprapelvic disposition among Africans. In Africans, the sigmoid colon was longer in males with a long-narrow shape. These differences may explain geographical and racial differences in sigmoid volvulus.