Definition: thickened inferior margin of the transversalis fascia seen as a fibrous band running parallel and posterior (deep) to the inguinal ligament, contributing to the posterior wall of the inguinal canal as it bridges the external iliac-femoral vessels in the sublinguinal space, passing from the anterior superior iliac spine to the lacunar ligament. It marks the inferior edge of the deep inguinal ring and the anterior margin of the femoral canal. Seen only when the inguinal region is viewed from its internal aspect, it is a useful landmark in laparoscopy of this region, as for repair of inguinal herniae.
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