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An aponeurosis, which separates the transversalis muscle from the peritoneum in the inguinal region. It arises above the posterior edge of the crural arch, where it seems to be continuous with the aponeurosis of the greater oblique muscle. Above, it is lost in the areolar tissue at the internal surface of the transversalis abdominis. Within, it is continuous with the outer edge of the tendon of the rectus muscle and Gimbernat's ligament; below, it is continuous with the aponeurosis of the greater oblique, and receives an expansion from the Fascia lliaca. Towards its middle and a little above the crural arch, the fascia transversalis has the wide orifice of a canal, which is occupied, in the female, by the round ligament of the uterus; and, in man, furnishes an expansion, that serves as a sheath to the spermatic vessels.