Surgery True about Ischiorectal fossa Boundaries A Anterior border is formed by inferior fascia of urogenital diaphragm. B Superior border is formed by Gluteus Maximus C Lateral border is formed by Levator Ani D Posterior border is formed by obturator internus muscle. 💡 Explanation True about Ischiorectal fossa Boundaries ✓ Correct Answer: A. Anterior border is formed by inferior fascia of urogenital diaphragm.