medial inguinal fossa medial inguinal fossa the medial inguinal fossa is a depression located within the inguinal triangle on the peritoneal surface of the anterior abdominal wall between the ridges formed by the lateral umbilical fold and the medial umbilical ligament, corresponding to the superficial inguinal ring. medial inguinal fossaposterior view of the anterior abdominal wall in its lower half. the peritoneum is in place, and the various cords are shining through.inguinal fossaedetailsidentifierslatinfossa inguinalis medialista98a10.1.02.432ta23794fma21022anatomical terminology clinical significance it is associated with direct inguinal hernias.