Parameters of the pubic visceral muscle. a Parameters of the pubic visceral muscle in non-POP patients. b Parameters of the pubic visceral muscle in POP patients. c In the MRI image, the border is outlined as the pubic rectal muscle, the brown-green circle is the rectum, and the white is the pelvic part. d Mimics 3D reconstruction of the pubic rectal muscle (pink), rectum (brown and green), and pelvis (white). POP, pelvic organ prolapse.