What part of the ischioanal (ischiorectal) fossa extends deep to the sacrotuberal ligament?

Posterior recess-the ischioanal fossa is a space found on both sides of the anal canal. it is bounded laterally by the obturator internus, superiorly by the pelvic diaphragm, and medially by the pelvic diaphragm and anus. it is the area that is lateral to the anal canal and inferior to the pelvic diaphragm. the anterior recesses are the parts of the ischioanal fossa that extend above the perineal membrane, and the posterior recesses extend deep to the sacrotuberal membrane and superior to the gluteus maximus. the genital hiatus is the place where the pelvic diaphragm splits to allow the urethra/vagina and anus to pass through. the pudendal canal travels from the lesser sciatic foramen, where its contents enter the perineum. it contains the internal pudendal artery, internal pudendal vein, and pudendal nerve.