The medial inguinal fossae are concave depressions of peritoneum in the paravesical space bounded by the medial umbilical folds and the lateral umbilical folds. The fossae are contained within the inguinal (Hesselbach’s) triangle. The right medial inguinal fossa typically partially contains the cecum and/or ileum and the left medial inguinal fossa partially contains the sigmoid colon. These abdominal structures can be displaced by ascites.
The medial inguinal fossa is the origin of most direct inguinal hernias.