Figure 1:

a. Schematic of intraabdominal pressure (IAP) on the pelvic floor (PF) at the level of the attachment of the levator ani muscles. b. example of plane oblique to include the inferior pubic point (F-1) and the ischial spines (left noted with F-2). c. pelvic floor measurements made in the oblique plane in a woman with larger obturator internus muscles. IPP- inferior pubic point, yellow dotted lines outline the obturator internus muscles, red solid line represents the anterior pelvic area, white dashed line represents the interspinous diameter. d. Measurements in a patient with a larger anterior pelvic area and smaller obturator internus muscles