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. Author manuscript; available in PMC: 2009 May 12.
Published in final edited form as: Am J Obstet Gynecol. 2007 Jul;197(1):52.e1–52.e7. doi: 10.1016/j.ajog.2007.04.026

Figure 2. Vaginal high-pressure zone in the transverse (axial) plane.

Figure 2

These 2D US images in the transverse plane (in the plane of the puborectalis muscle; a line connecting the lower end of the pubic symphysis with the ano-rectal angle) were extracted from the 3D US volumes. These 3D US volumes were obtained with no bag in the vagina and the bag distended with 45cc, 60cc and 70 cc of water. Note that the bag dimensions are significantly greater in the lateral as compared to the AP direction. With the increase in the bag volumes the lateral dimensions of the bag do not change but there is a gradual increase in the AP dimension of the vaginal HPZ.