Ischioanal Fossae Anatomy
Ureter, Extraperitoneal (supralevator) space (fibrofatty tissue), Fat
body of ischioanal fossa, Deeper part, Superficial (perianal) part, Transverse
fibrous septum of ischioanal fossa, Submucous space (internal venous plexus), Perianal
space (external venous plexus),
Intersphincteric groove (anocutaneous line)
Internal anal sphincter muscle, Conjoined longitudinal muscle, External anal
sphincter muscle, Rectal fascia, Peritoneum (cut edge) forming floor of
pararectal fossa, Levator ani muscle and superior and inferior fascia of pelvic
diaphragm, Sacrogenital fold (uterosacral in female), Tendinous arch of levator
ani muscle, Ischial tuberosity, Pudendal canal (Alcock’s) contains internal
pudendal vessels, pudendal nerve, and perineal nerve, Obturator internus muscle
and fascia, Iliopectineal line, External iliac vessels, Iliacus muscle and
fascia, Sigmoid colon.
