Fig. 37-2. Muscles of the pelvic diaphragm, pelvic aspect, showing different parts of the levator ani. The pubococcygeus has several portions, sphincter vaginae, puborectalis, and pubococcygeus proper, depending upon the direction and insertion of the fibers. Some fibers of the puborectalis pass toward the sphincter ani externus and can elevate the anus. Click for high resolution image.