Perineum

The perineum corresponds to the outlet of the pelvis. Its deep boundaries are: in front, the pubic arch and the arcuate ligament of the pubis;behind, the tip of the coccyx; and on either side the inferior rami of the pubis and ischium, and the sacrotuberous ligament....

Pelvic Diaphragm

The muscles within the pelvis may be divided into two groups: the Obturator Internus and the Piriformis, which are muscles of the lower extremity, and will be described with these;the Levator Ani and the Coccygeus or Ischiococcygeus, which together form the pelvic...