<prompt> Most common postprandial motility is seen inAscending colonTransverse colonsDescending colonSigmoid colon  <response>: It;s sigmoid colon Tonic and phasic colonic motility and compliance of the transverse and sigmoid colon were therefore assessed using a combined barostat-manometry assembly in 22 healthy subjects. Measured colonic compliance was corrected by subtraction of the compliance of the closed barostat system. The mean SEM preprandial colonic volumes in the transverse and sigmoid colon were similar 150 12 and 128 13 ml, p NS, corresponding to calculated mean SEM colonic diameters of 4.3 cm and 4.0 cm respectively. The mean increase in colonic tone postprandially was significantly greater in the transverse 24.1 3.5 than in the sigmoid colon 13.1 3.0, p 0.01. The mean increase in phasic contractility was significantly greater, however, in the sigmoid than in the transverse colon 1270 210 and 425 60 mm Hg90 min respectively, p 0.01. Compliance was greater in the transverse than sigmoid colon 7.6 0.44 and 4.1 0.15 mlmm Hg, p 0.001. The fasting volume of the colon was significantly correlated with the magnitude of the tonic response to the meal in the transverse and sigmoid colon p 0.001 for both. In conclusion, there are quantitatively different but qualitatively similar phasic and tonic responses to the meal in the two colonic regions. Differences in the viscoelastic and luminal dimensions may paly account for these differences in tonic responses.Ref: Ganong;s review of medical physiology 23rd edition Page no: 475 