<prompt> Lateral border of ischeorectal fossa is formed by?Gluteus maximusPerineal membranePelvic diaphramObturator internus  <response>: Ans. is d i.e., Obturator internus Boundries of ischeoanal ischeorectal fossa are :- i Anteriorly :- Posterior border of perineal membrane . ii Posteriorly :- Gluteus maximus muscle, sacrotuberous ligament. iii Laterally :- Ischial tuberosity and obturator internus. iv Medially :- Sphincter ani externus external anal sphincter and pelvic diaphragm levator ani. 