Rogers J, Hayward M P, Henry M M, Misiewicz J J
Department of Gastroenterology and Nutrition, Central Middlesex Hospital, London, UK.
Br J Surg. 1988 Nov;75(11):1083-5. doi: 10.1002/bjs.1800751111.
Temperature difference between the rectum and anal canal is a fundamental requirement for the hypothesis that temperature sensation is of physiological importance in discrimination of anorectal contents occurring during the 'sampling reflex'. The temperature gradient between the rectum and the anal canal was measured in 47 normal subjects (mean age 51.6 years +/- 16.8 s.d., 24 men). The maximum mean difference in temperature between the rectum and the anal canal was 0.13 degrees C (0.06-0.19, 95 per cent confidence intervals) and occurred 4 cm from the anal verge. This difference is too small to be detected by the anal canal mucosa. Under normal physiological circumstances the conscious appreciation of temperature of faeces passing from the rectum to the anal canal is impossible during the anorectal sampling reflex.
在“采样反射”过程中，温度感觉对于辨别肛管直肠内容物具有生理重要性。对47名正常受试者（平均年龄51.6岁±16.8标准差，24名男性）测量了直肠与肛管之间的温度梯度。直肠与肛管之间温度的最大平均差值为0.13℃（0.06 - 0.19，95%置信区间），出现在距肛缘4厘米处。这种差异太小，肛管黏膜无法察觉。在正常生理情况下，在肛管直肠采样反射过程中，不可能自觉感知从直肠进入肛管的粪便温度。
