The medial arcuate ligament is a dense connective tissue band that forms part of the fibrous arch of the diaphragm, which separates the thoracic and abdominal cavities. However, there are several synonyms for medial arcuate ligament. The medial fibrous arch, medial crus, and medial diaphragmatic arch are common alternatives. These terms all refer to the same structure, and their usage generally depends on the writer's preference or intended audience. Regardless of the name used, the medial ligament plays an essential role in supporting and stabilizing the diaphragm, facilitating proper breathing, and protecting the internal organs.