Muscles of the back and pelvis, and urethra, shown in isolation with spine, pelvic bones and femur, in 4 numbered illustrations. 1 illustration of pelvis with lumbar vertebrae and femurs, showing psoas muscles, iliacus muscles. Anterior view. 3 illustrations of pubic bones with penis divided to show urethra. 1 illustration show stricture of the urethra. Anterior, lateral and posterior views.