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. Author manuscript; available in PMC: 2015 Sep 11.
Published in final edited form as: Neurogastroenterol Motil. 2012 Jan 11;24(3):e147–e154. doi: 10.1111/j.1365-2982.2011.01857.x

Figure 4.

Figure 4

Mean relaxation pressure from all subjects every 4 millimeters along the anterior and posterior anal canal at a mean 15 cc and 101 cc rectal distention volume. The mean 15 cc rectal distention volume shows a constant 20 mmHg relaxation pressure ranging from 1.2 cm to 3.6 cm in the anterior and posterior anal canal, while the 101 cc rectal distention volume shows a peak at 1.7 cm from the anal verge and a larger pressure change in the superior-posterior anal canal region compared to the superior-anterior region, indicating both the IAS and puborectalis are relaxing.